Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu quan » lieu quan, thien quan, lien quan
tang van » dang van, hoang van, trong van
cac truc » cau truc, cac tru, cac trung
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
van hoc » van hoa
ky tang » ky nang, ky dang, kho tang
dan va » doan va, dan ca, ban va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky tang van hoc. ((hieu quan) or (hieu qua)) cac truc va ((don vi) or (dan va)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky tang van hoc. ((hieu quan) OR (hieu qua)) cac truc va ((don vi) OR (dan va)) cua te.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky tang van hoc. ((hieu quan) or (hieu qua)) cac truc va ((don vi) or (dan va)) cua te*.