Perhaps you should try some spelling variations:
van cham » van chat, van tham, va cham
cham luc » cham soc, nhan luc, cham cuu
hang tai » hang va, dung tai
hieu van » hieu va, thien van, lieu va
han tai » nhan tai, van tai, toan tai
luc van » luoc van, luu van, duc van
te sach » toc sach
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (su sach)) ky nang xa hoi. hieu van cham luc van ((han tai) OR (hang tai)) va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ky nang xa hoi. hieu van cham luc van ((han tai) OR (hang tai)) va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (su sach)) ky nang xa hoi. hieu van cham luc van ((han tai) OR (hang tai)) va thiet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (su sach)) ky nang xa hoi. hieu van cham luc van ((han tai) OR (hang tai)) va thiet*.