Perhaps you should try some spelling variations:
hac truc » hoc truc, hang truc, sach truc
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
qua hac » qua hai, qua cac, qua hoat
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
vai va » mai va, dai va, hai va
x hoi » xa hoi, o hoi, x ho
vi va » vi van, vu va, bi 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) or (co sach)) y nang x hoi. hieu qua hac truc va hanh ((vi va) or (vai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) y nang x hoi. hieu qua hac truc va hanh ((vi va) OR (vai va)) triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) y nang x hoi. hieu qua hac truc va hanh ((vi va) or (vai va)) triet*.