Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va doanh » van doanh, vay doanh, va danh
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, te sach, tu cach
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
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: ((tu sach) OR (su sach)) ky nang xa hoi. ((hieu ve) or (hieu van)) cham luc va doanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. ((hieu ve) OR (hieu van)) cham luc va doanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang xa hoi. ((hieu ve) or (hieu van)) cham luc va doanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang xa hoi. ((hieu ve) or (hieu van)) cham luc va doanh tai cua tre*.