Perhaps you should try some spelling variations:
chat luc » chat xuc, chat lua, nhan luc
van thai » van thoai, van tai, van thi
va thieu » va thiet, va hieu, va tieu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
van hai » van ha, van chat, van hanh
luc va » duc va, tuc va, loc 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 (lang xa)) hoi. hieu ve chat luc va ((van thai) or (van hai)) va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. hieu ve chat luc va ((van thai) OR (van hai)) va thieu.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang xa)) hoi. hieu ve chat luc va ((van thai) or (van hai)) va thieu*.