Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
tuc van » thuc van, truc van, tuc va
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
vi cau » ve cau, di cau, viet cau
va cau » van cau, va dau, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (nang ma)) hoi. lieu ((va cau) or (va cac)) tuc van thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang ma)) hoi. lieu ((va cau) OR (va cac)) tuc van thanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (nang ma)) hoi. lieu ((va cau) or (va cac)) tuc van thanh vi cau tren*.