Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
va doanh » vay doanh, va danh, hoa doanh
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
ve cham » ve chat, vu cham, ve chim
va cham » va chat, va tham
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 xa hoi. hieu ((ve cham) OR (va cham)) tuc ((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 xa hoi. hieu ((ve cham) OR (va cham)) tuc ((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 xa hoi. hieu ((ve cham) OR (va cham)) tuc ((va doanh) or (van doanh)) tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang xa hoi. hieu ((ve cham) OR (va cham)) tuc ((va doanh) or (van doanh)) tai cuc tre*.