Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
hang dau » hang va, hang tai
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa

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 ve cam tuc va ((doanh van) or (((dung va) or (hang dau)))) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. hieu ve cam tuc va ((doanh van) OR (((dung va) OR (hang dau)))) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ve cam tuc va ((doanh van) or (((dung va) or (hang dau)))) cua tre*.