Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
hien cac » thien cac, vien cac, hieu cac
cuu tre » cua tre, cau tren, cau treo
tu sach » thu sach, su sach, te sach
dinh va » dinh van, dinh ve, tinh va
cac lao » ca lao, cac loai, cac giao
nang xa » nang x, lang xa, nang ma
va dinh » van dinh, va kinh, va tinh
lao va » tao va, cao va, bao va

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 tru nang xa hoi. dieu hien cac lao va dinh va ((cuu tre) or (((cua triet) or (su triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tru nang xa hoi. dieu hien cac lao va dinh va ((cuu tre) OR (((cua triet) OR (su triet)))).
• Adding a wildcard symbol may retrieve word variants: tu sach tru nang xa hoi. dieu hien cac lao va dinh va ((cuu tre) or (((cua triet) or (su triet))))*.