Perhaps you should try some spelling variations:
cac truc » cau truc, cac tru, cac trung
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
qua cac » cua cac
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
vu va » vu van, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang ma hoa. hieu qua cac truc va hanh ((vu va) or (tu va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ma hoa. hieu qua cac truc va hanh ((vu va) OR (tu va)) triet*.