Perhaps you should try some spelling variations:
trien hoat » tien hoa
trinh han » trinh quan
hieu soat » hieu suat, hieu hoat, hieu luat
dung pham » dung phan, hung pham, tung pham
tien soat » thien hoat, kiem soat, tien hoa
han lang » nhan lang, ban lang, ha lang
lang van » dang van, tang van, hoang van
van hieu » cao hieu

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

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