Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
thien hoat » trien hoat, thien thuat, tien hoa
quan lang » quan hoang, gian lang, quan luan
hieu suat » hieu luat, hieu qua
hieu soat » hieu hoat, hieu luat, kiem soat
lang van » dang van, tang van, hoang van
van hieu » cao hieu
dung nam » dong nam, dung lam, sung nam
nam van » nam dan, nam va, pham van

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh quan lang van ((hieu suat) or (thien hoat)) ) or ( tin dung nam van hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh quan lang van ((hieu suat) OR (thien hoat)) ) OR ( tin dung nam van hieu soat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh quan lang van ((hieu suat) or (thien hoat)) ) or ( tin dung nam van hieu soat ))*.