Perhaps you should try some spelling variations:
vay tieu » day tieu, van tieu, may tien
sach thu » sach thue, sach thieu, sach tham
va thieu » va thiet, va hieu, va tieu
danh va » doanh va, hanh va, anh va
va danh » va dinh, va dan, va hanh
chao tu » chao xu, cho tu, cao tu
su sach » so sach, vu sach
ve chao » ve chat, ve cham, ve cho
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
hieu ve » hieu va, hieu van

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 thu ((nang xa) or (nang ma)) hoi. hieu ve chao tu va danh va ((va thieu) or (vay tieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((nang xa) OR (nang ma)) hoi. hieu ve chao tu va danh va ((va thieu) OR (vay tieu)).
• Adding a wildcard symbol may retrieve word variants: su sach thu ((nang xa) or (nang ma)) hoi. hieu ve chao tu va danh va ((va thieu) or (vay tieu))*.