Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
dung hoa » dung khoa, duong hoa, dung hoai
hieu van » hieu va, thien van, lieu va
hoa hoi » khoa hoi, hoa hoc, hoa doi
cam duc » cam xuc, cao duc, nam duoc
ly dung » ly dong, xay dung, ly khung
san ly » van ly, ban ly
cua te » cua tu
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 ly dung hoa hoi. hieu van ((cam duc) OR (pham duc)) ban thanh vi ((cua te) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc san ly dung hoa hoi. hieu van ((cam duc) OR (pham duc)) ban thanh vi ((cua te) OR (cua su))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc san ly dung hoa hoi. hieu van ((cam duc) OR (pham duc)) ban thanh vi ((cua te) or (cua su))*".