Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
trung va » truong va, trang va, trung ha
nang ma » tang ma, sang ma, nang cao
truc va » thuc va, thuc vat
ca viet » va viet, co viet, hoa viet
sinh y » sinh ly
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
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: cho sinh y nang ma hoi. hieu van cham ((truc va) or (trung va)) hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho sinh y nang ma hoi. hieu van cham ((truc va) OR (trung va)) hanh vi ca viet.
• Adding a wildcard symbol may retrieve word variants: cho sinh y nang ma hoi. hieu van cham ((truc va) or (trung va)) hanh vi ca viet*.