Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
cua thong » cua thuong, cua khong, cua tong
hoc hieu » hoc thieu, hoc hien, doc hieu
hieu cac » hieu luc, hieu va, hieu van
canh dan » canh van, sanh dan, thanh dan
tan toan » tap toan, van toan, dan toan
anh van » anh va, thanh van, doanh van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu cac - ((canh dan) or (anh van)) cua thong cong ((tan toan) OR (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cac - ((canh dan) OR (anh van)) cua thong cong ((tan toan) OR (tan tran)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cac - ((canh dan) or (anh van)) cua thong cong ((tan toan) OR (tan tran)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cac - ((canh dan) or (anh van)) cua thong cong ((tan toan) OR (tan tran)) cau*.