Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
truc gia » truc giac, thuc giai, tac gia
tuc gia » tac gia, duc gia, toc gia
van cau » van dau, van hau, van chat
so sanh » do sanh
nang ma » tang ma, sang ma, nang cao
ca viet » va viet, co viet, hoa viet
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
vi ca » vit ca, li ca, va ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sanh) or (cho sinh)) y nang ma hoi. hieu van cau ((truc gia) OR (tuc gia)) thanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sanh) OR (cho sinh)) y nang ma hoi. hieu van cau ((truc gia) OR (tuc gia)) thanh vi ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sanh) or (cho sinh)) y nang ma hoi. hieu van cau ((truc gia) OR (tuc gia)) thanh vi ca viet".
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (cho sinh)) y nang ma hoi. hieu van cau ((truc gia) OR (tuc gia)) thanh vi ca viet*.