Perhaps you should try some spelling variations:
hang thai » hoang thai, hang tai, hang hai
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
va thieu » va thiet, va hieu, va tieu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
va hang » van hang, va nang, va lang
thai va » thai van
soc va » hoc va, loc va, doc va

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 ky ((nang xa) or (nang x)) hoi. hieu van cham soc va hang thai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (nang x)) hoi. hieu van cham soc va hang thai va thieu.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (nang x)) hoi. hieu van cham soc va hang thai va thieu*.