Perhaps you should try some spelling variations:
trien khoa » trien nha, trien khai, trien hoat
hieu soat » hieu suat, hieu hoat, hieu luat
dinh rang » dinh lang, dinh quang, dinh trong
van trien » van tien, va trien, van tren
luan han » luan hoan, luan phan, luan van
han hieu » phan hieu, hang hieu, nhan hieu
rang ha » rang ham, trang ha, lang ha
ha van » hoa van, nha van, va van
tin » tinh

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 luan han hieu soat ) or ( dinh rang ha van trien khoa ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan han hieu soat ) OR ( dinh rang ha van trien khoa ))*.