Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
danh vi » hanh vi, dinh vi, danh di
luc va » tuc va, loc va
vi cua » vai cua, di cua
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((sang ma) or (mang may)) hoi. hieu van cham ((luc va) or (duc va)) danh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((sang ma) OR (mang may)) hoi. hieu van cham ((luc va) OR (duc va)) danh vi cua su.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((sang ma) or (mang may)) hoi. hieu van cham ((luc va) or (duc va)) danh vi cua su*.