Perhaps you should try some spelling variations:
van doanh » van dong, van thanh, van anh
cham luc » cham soc, nhan luc, cham cuu
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
toan » tran

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 ty nang xa hoi. hieu vu cham luc ((van doanh) OR (toan doanh)) tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu vu cham luc ((van doanh) OR (toan doanh)) tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu vu cham luc ((van doanh) OR (toan doanh)) tai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu vu cham luc ((van doanh) OR (toan doanh)) tai ((cua tre) or (cuu tre))*.