Perhaps you should try some spelling variations:
trinh dang » trinh dung, trinh dan, trinh bang
dang quang » dung quang, dang hung
quang van » quang ban, quan van, quang uan
hieu suat » hieu qua
hieu luat » hieu qua
tinh nang » trinh nang, tin nang, tich nang
nang quan » ban quan, nang suat
quan binh » quang binh, quang ninh, quang minh
binh hien » minh hien, kinh hien, dinh hien
hien soat » thien hoat, kiem soat, bien soan

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

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