Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thu sach » tu sach, thuat sach, thuoc sach
va doanh » van doanh, vay doanh, va danh
dai tai » dai thao
dai hai » dai han, dai hoi, dai thao
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
ky lang » ky nang, ky dang, ky tang
van cau » van dau, van hau, van chat
cau tre » cau tren, cau treo, cau tra
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: thu sach ky lang ((dai tai) OR (dai hai)). hieu ve cam tuc va doanh van cau tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky lang ((dai tai) OR (dai hai)). hieu ve cam tuc va doanh van cau tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang ((dai tai) OR (dai hai)). hieu ve cam tuc va doanh van cau tre*.