Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
thu sach » tu sach, thuat sach, thuoc sach
nano cau » nang cau, bang cau, nano va
danh vai » danh sai, danh va, dang van
nano xa » nano va, nano bac, nano dua
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
cam tuc » cam xuc, cam tu, nam thuc
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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 ty ((nano xa) or (nano cau)) hoi. hieu ve cam tuc xa ((danh vai) OR (doanh van)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nano xa) OR (nano cau)) hoi. hieu ve cam tuc xa ((danh vai) OR (doanh van)) cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nano xa) or (nano cau)) hoi. hieu ve cam tuc xa ((danh vai) OR (doanh van)) cua te*".