Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
hoa doanh » toan doanh, hoa dan
cham tuc » nham thuc, pham thuc, tham thuc
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly quang
ly vang » ly hang, ly van, ly quang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu 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 vang)) xa hoi. hieu ve cham tuc ((hoa 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 vang)) xa hoi. hieu ve cham tuc ((hoa 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 vang)) xa hoi. hieu ve cham tuc ((hoa doanh) or (van doanh)) tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ly nang) OR (ly vang)) xa hoi. hieu ve cham tuc ((hoa doanh) or (van doanh)) tai cuc tre*.