Perhaps you should try some spelling variations:
luong quang » luong quan, dung quang
dinh luong » dinh duong, dinh huong, dinh cuong
quang van » quang ban, quan van, quang uan
dung dat » dung va, dung tai
doc hieu » toc thieu, hoc thieu, hoc hien
van hien » van hieu, van tien
dat doc » dat duoc, day doc, dat nuoc
hien so » khien so, bien so, hieu so
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 dat doc hieu qua ) or ( dinh luong quang van hien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung dat doc hieu qua ) OR ( dinh luong quang van hien so )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung dat doc hieu qua ) or ( dinh luong quang van hien so ))*.