Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhung cong » dung cong, thong cong, hang cong
hieu quan » hieu qua, lieu quan, thien quan
trung ha » trung hoc, trung tam, trung cap
ha nhung » hoa nhung, hay nhung, pha nhung
cong van » cong vang, cong san, song van
tuan tai » toan tai, quan tai, tan tai
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu quan - thanh trung ha nhung cong van ((tuyen tap) or (tuan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quan - thanh trung ha nhung cong van ((tuyen tap) OR (tuan tai)).
• Adding a wildcard symbol may retrieve word variants: ho hieu quan - thanh trung ha nhung cong van ((tuyen tap) or (tuan tai))*.