Perhaps you should try some spelling variations:
trinh dang » trinh dung, trinh dan, trinh bang
dang quang » dung quang, nang quan, dang hung
manh luong » manh cuong, manh long, manh tuong
luong xuan » luong quan, luong quang, luong cua
quang van » quang ban, quan van, quang uan
hieu suat » hieu luat, hieu qua
kien soat » kiem soat, bien soan, kien hoa
van hieu » cao hieu
xuan can » xuan cang, xuan tan, xuan chanh
can kien » van kien, cau kien, cap kien

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 ( manh luong xuan can kien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dang quang van hieu suat ) OR ( manh luong xuan can kien soat ))*.