Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
nang cong » nang song, dang cong, bang cong
tan thanh » tran thanh, tang thanh, toan thanh
trang va » tran van, hang va
tan than » tan tran, ban than, tam than
ho hieu » ho chieu, hoi hieu, nho hieu
tang va » tang van, thang va, tang vat

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 - hanh ((tang va) or (trang va)) nang cong ((tan than) OR (tan thanh)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu quan - hanh ((tang va) OR (trang va)) nang cong ((tan than) OR (tan thanh)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu quan - hanh ((tang va) or (trang va)) nang cong ((tan than) OR (tan thanh)) ban".
• Adding a wildcard symbol may retrieve word variants: ho hieu quan - hanh ((tang va) or (trang va)) nang cong ((tan than) OR (tan thanh)) ban*.