Perhaps you should try some spelling variations:
tinh tinh » trinh tinh, tinh ninh, tinh binh
quang dan » quang dang, quang doan, quang ban
dung hung » dung chung, dung nhung, dung huong
hieu suat » hieu luat, hieu qua
dan bien » dan vien, dau bien, day bien
hung huu » hung huy, duong huu, luong huu
huu hieu » huu hiep, thuc hieu, thau hieu
bien so » bien doi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh tinh quang dan bien so ) or ( tin dung hung huu hieu suat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh tinh quang dan bien so ) OR ( tin dung hung huu hieu suat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh tinh quang dan bien so ) or ( tin dung hung huu hieu suat ))*.