Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
va doanh » van doanh, vay doanh, va danh
nang lai » nang tai, nang cai, nang hai
mang lai » mang lam, mang luoi, dang loai
vu sach » vu bach, su sach, vu khach
cua tre » cuu tre, cua triet, dua tren
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
cam luc » cam xuc, cau luc
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
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: vu sach ky ((nang lai) OR (mang lai)) roi. hieu ve cam luc va doanh van ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang lai) OR (mang lai)) roi. hieu ve cam luc va doanh van ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((nang lai) OR (mang lai)) roi. hieu ve cam luc va doanh van ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang lai) OR (mang lai)) roi. hieu ve cam luc va doanh van ((cua tre) or (cua te))*.