Perhaps you should try some spelling variations:
tinh quanng » tinh quang, dinh quang, minh quang
quanng luan » quan luan, quang tuan, quang uan
hieu soat » hieu suat, hieu hoat, kiem soat
hieu luat » hieu qua
hieu quan » hieu qua, thien quan, lien quan
lieu quan » lien quan, hieu qua, lieu van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tinh quanng luan van ((hieu soat) or (((hieu luat) or (((hieu quan) OR (lieu quan))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tinh quanng luan van ((hieu soat) OR (((hieu luat) OR (((hieu quan) OR (lieu quan)))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tinh quanng luan van ((hieu soat) or (((hieu luat) or (((hieu quan) OR (lieu quan))))))".
• Adding a wildcard symbol may retrieve word variants: tinh quanng luan van ((hieu soat) or (((hieu luat) or (((hieu quan) OR (lieu quan))))))*.