Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hien cac » thien cac, vien cac, hieu cac
dinh vai » dinh van, dinh vi, dinh va
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
cac lao » ca lao, cac loai, cac giao
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
su viet » so viet
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: su sach tu lang xa hoi. dieu hien cac lao va dinh vai ((cua tre) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu lang xa hoi. dieu hien cac lao va dinh vai ((cua tre) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: su sach tu lang xa hoi. dieu hien cac lao va dinh vai ((cua tre) or (su viet))*.