Perhaps you should try some spelling variations:
thien van » thi van
doanh van » doanh va, doanh ban, doanh nhan
doan van » doan va, hoang van, luan van
nam duoc » nam thuoc, da duoc, dat duoc
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
duoc va » nuoc va, duc va, duoc ma
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
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: te sac ky ((nang xa) or (nang ma)) hoi. thien van nam duoc va ((doanh van) OR (doan van)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((nang xa) OR (nang ma)) hoi. thien van nam duoc va ((doanh van) OR (doan van)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((nang xa) or (nang ma)) hoi. thien van nam duoc va ((doanh van) OR (doan van)) cua te".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((nang xa) or (nang ma)) hoi. thien van nam duoc va ((doanh van) OR (doan van)) cua te*.