Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
vu sach » vu bach, su sach, vu khach
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va cham » va chat, va tham
van tai » von tai, van tuan
xuc va » tuc va, luc va, xac va
tai va » thai va, mai va, tri va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y ((nang xa) or (nang x)) hoi. hieu va cham ((xuc va) or (duc va)) van tai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((nang xa) OR (nang x)) hoi. hieu va cham ((xuc va) OR (duc va)) van tai va thieu.
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (nang x)) hoi. hieu va cham ((xuc va) or (duc va)) van tai va thieu*.