Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban dinh » ban tinh, van dinh, ban dich
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
van bao » van ban, van dao
bao thu » bao thuc, ba thu, ban thu
thu ban » thu hang
dinh vi » dinh ve, dinh viet, dinh tri
vi cua » vai cua, di cua
cua te » cua tu

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 x) or (nang ma)) hoi. hieu van bao thu ban dinh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((nang x) OR (nang ma)) hoi. hieu van bao thu ban dinh vi cua te.
• Adding a wildcard symbol may retrieve word variants: so sach y ((nang x) or (nang ma)) hoi. hieu van bao thu ban dinh vi cua te*.