Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
nham thuc » nhan thuc, nam thuc, nham thu
va doanh » vay doanh, va danh, hoa doanh
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly vang, ly quang
ly hang » ly quang
hieu ve » hieu va, hieu van
ve nham » ve nha, ve cham
cuc tre » duc tre, cua tre, cuu tre

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 ((ly nang) OR (ly hang)) xa hoi. hieu ve nham thuc ((va doanh) or (van doanh)) tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ly nang) OR (ly hang)) xa hoi. hieu ve nham thuc ((va doanh) OR (van doanh)) tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ly nang) OR (ly hang)) xa hoi. hieu ve nham thuc ((va doanh) or (van doanh)) tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) OR (ly hang)) xa hoi. hieu ve nham thuc ((va doanh) or (van doanh)) tai cuc tre*.