Perhaps you should try some spelling variations:
luong quan » thong quan, duong qua
minh luong » dinh luong, minh tuong, minh cuong
hieu luat » hieu qua
luan bien » luan lien, xuan bien, luong bien
dung dat » dung va, dung tai
chi hieu » cao hieu, chi tiet, co hieu
dat chi » dat cho, dat thi, dau chi
bien so » bien doi
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 chi hieu luat ) or ( minh luong quan luan bien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung dat chi hieu luat ) OR ( minh luong quan luan bien so )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung dat chi hieu luat ) or ( minh luong quan luan bien so ))*.