Perhaps you should try some spelling variations:
dung thang » hung thang, cung thang, dung thuong
thang van » tang van, thanh van, thong van
hieu soat » hieu suat, hieu hoat, hieu luat
tinh quan » tinh quang, trinh quan, tin quan
luan doan » luan hoan, quan doan, luat doanh
doan gian » dan gian, don gian, doanh giao
van hieu » cao hieu
gian dan » gian lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung thang van hieu soat ) or ( tinh quan luan doan gian dan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung thang van hieu soat ) OR ( tinh quan luan doan gian dan )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung thang van hieu soat ) or ( tinh quan luan doan gian dan ))*.