Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
han thai » han tai, ban thai, van thai
va thieu » va thiet, va hieu, va tieu
so sach » so sanh, bo sach, co sach
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
duc van » duc va, duc tan, duc manh
van han » van hanh, van phan, van nhan
thai va » thai van

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