Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
thong cong » trong cong, thong thong, phong chong
hieu lang » chieu sang, hieu quang, nhieu tang
tong cong » trong cong, cong cong, dung cong
toan ban » van ban
toan cao » toan tap
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 lang - hanh trinh quan ((thong cong) OR (tong cong)) manh ((toan ban) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trinh quan ((thong cong) OR (tong cong)) manh ((toan ban) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh trinh quan ((thong cong) OR (tong cong)) manh ((toan ban) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh trinh quan ((thong cong) OR (tong cong)) manh ((toan ban) or (toan cao))*.