Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, dua ban, duc man
dong ha » dong hoa, dong va, dong hoc
van cam » van nam, van lam, van cau
ky dong » ly dong, ky dang, ky cong
duc van » duc va, duc tan, duc manh
cua te » cua tu
san ky » sang ky, van ky, dan ky
ha hoi » hoa hoi, ha noi, xa hoi
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc san ky dong ha hoi. hieu van cam ((duc ban) OR (duc van)) thanh vi ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc san ky dong ha hoi. hieu van cam ((duc ban) OR (duc van)) thanh vi ((cua te) OR (cua su))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc san ky dong ha hoi. hieu van cam ((duc ban) OR (duc van)) thanh vi ((cua te) or (cua su))*".