Perhaps you should try some spelling variations:
trien hoat » tien hoa
trinh han » trinh quan
hieu soat » hieu suat, hieu hoat, hieu luat
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
tin dong » tien dong, tin dung, tin don
dong nam » dong ha, dong tai, dong va
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 han lang van hieu soat ) or ( tin dong nam 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 dong nam van ((tien soat) OR (trien hoat)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh han lang van hieu soat ) or ( tin dong nam van ((tien soat) OR (trien hoat)) ))".
• Adding a wildcard symbol may retrieve word variants: (( trinh han lang van hieu soat ) or ( tin dong nam van ((tien soat) OR (trien hoat)) ))*.