Perhaps you should try some spelling variations:
luong quang » luong quan, dung quang
dinh luong » dinh duong, dinh huong, dinh cuong
thien hoat » trien hoat, thien thuat, tien hoa
hieu soat » hieu suat, hieu hoat, hieu luat
quang van » quang ban, quan van, quang uan
kien soat » kiem soat, bien soan, kien hoa
dung lan » dung luan, dung land, dung lam
van kien » van tien, van hien, van chien
lan van » luan van, lang van, tan 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 lan van ((hieu soat) or (thien hoat)) ) or ( dinh luong quang van kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung lan van ((hieu soat) OR (thien hoat)) ) OR ( dinh luong quang van kien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung lan van ((hieu soat) or (thien hoat)) ) or ( dinh luong quang van kien soat ))*.