Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
danh vai » danh sai, danh va, dang van
cam duc » cam xuc, cao duc, pham duc
cuu tre » cua tre, cau tren, cau treo
sach tu » sach thu, cach tu, sach uu
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
sach ty » sach y, sach thu, xach tay
ve cam » ve cham, ve cac, va cam

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 tu) OR (sach ty)) tang xa hoi. hieu ve cam duc va ((danh vai) or (doanh van)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach tu) OR (sach ty)) tang xa hoi. hieu ve cam duc va ((danh vai) OR (doanh van)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach tu) OR (sach ty)) tang xa hoi. hieu ve cam duc va ((danh vai) or (doanh van)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach tu) OR (sach ty)) tang xa hoi. hieu ve cam duc va ((danh vai) or (doanh van)) cuu tre*.