Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thuat lanh » thuat lap, thuat san
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
dau phuc » cau phuc, dieu phuc, dau khu
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, nang cao
van dau » van dao, phan dau
phuc va » phuc vu, thuc va, chuc va
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
dai va » mai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (thuat lanh)) y nang ma hoi. hieu van dau phuc va hanh dai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (thuat lanh)) y nang ma hoi. hieu van dau phuc va hanh dai va triet.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (thuat lanh)) y nang ma hoi. hieu van dau phuc va hanh dai va triet*.