Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, nang ma
va nang » van nang, da nang, cam nang
hieu va » hieu qua
sach va » sach xa, sach ha, sach dao
cam tuc » cam xuc, cam tu, nam thuc
va hanh » van hanh, va thanh, va danh
tuc va » thuc va, truc va, tuc xa
de van » le van, do van, he van
ve van » le van

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach va nang xa hoi. ((hieu va) or (lieu va)) cam tuc va hanh ((de van) or (ve van)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach va nang xa hoi. ((hieu va) OR (lieu va)) cam tuc va hanh ((de van) OR (ve van)) triet.
• Adding a wildcard symbol may retrieve word variants: toc sach va nang xa hoi. ((hieu va) or (lieu va)) cam tuc va hanh ((de van) or (ve van)) triet*.