Perhaps you should try some spelling variations:
chat luc » chat xuc, chat lua, nhan luc
han thai » han tai, ban thai, van thai
va thieu » va thiet, va hieu, va tieu
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
luc van » luoc van, luu van, duc van
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: su ((sach y) or (cac ky)) nang xa hoi. hieu ve chat luc van han thai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (cac ky)) nang xa hoi. hieu ve chat luc van han thai va thieu.
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (cac ky)) nang xa hoi. hieu ve chat luc van han thai va thieu*.