Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
nhan luc » nang luc
vang cua » mang cua, hang cua, tang cua
va doanh » vay doanh, va danh, hoa doanh
tu sach » thu sach, te sach, tu cach
ve nhan » ve nha, de nhan, va nhan
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang

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)) y lang xa hoi. hieu ve nhan luc ((va doanh) or (van doanh)) vang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y lang xa hoi. hieu ve nhan luc ((va doanh) OR (van doanh)) vang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y lang xa hoi. hieu ve nhan luc ((va doanh) or (van doanh)) vang cua tre*".