Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
dinh vai » dinh van, dinh vi, dinh va
thu bang » thu ban, thu hang, chu bang
su triet » su tien, ve triet
hien cac » thien cac, vien cac, hieu cac
sach thu » sach thue, sach thieu, sach tham
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
su viet » so viet
va dinh » van dinh, va kinh, va tinh
cac lao » ca lao, cac loai, cac giao
bang x » nang x, bang _, bang 2
lao va » tao va, cao va, bao va
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu bang x hoi. dieu hien cac lao va dinh vai ((cua tre) or (((su triet) OR (su viet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu bang x hoi. dieu hien cac lao va dinh vai ((cua tre) OR (((su triet) OR (su viet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu bang x hoi. dieu hien cac lao va dinh vai ((cua tre) or (((su triet) OR (su viet))))".
• Adding a wildcard symbol may retrieve word variants: tu sach thu bang x hoi. dieu hien cac lao va dinh vai ((cua tre) or (((su triet) OR (su viet))))*.