Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
ta thanh » tai thanh, va thanh, ha thanh
ket van » viet van, ket doan, kien van
cam tuc » cam xuc, cam tu, nam thuc
te sach » toc sach
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
tuc ta » tuc tap, tuc tao, tuc tat
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (hoc sach)) ky tang xa hoi. hieu va cam tuc ta thanh ((ket va) or (ket van)) trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ky tang xa hoi. hieu va cam tuc ta thanh ((ket va) OR (ket van)) trien.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ky tang xa hoi. hieu va cam tuc ta thanh ((ket va) or (ket van)) trien*.