Perhaps you should try some spelling variations:
canh thanh » canh tranh, danh thanh, anh thanh
thanh toan » thanh hoa, thanh san, tinh toan
thong cong » trong cong, tong cong, thong thong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thiet anh » thien anh, thuyet anh, thien danh
cong hoan » cong hoa, dong hoa, cong san
can cau » van cau, ban cau, ca cau
van hau » van ha, van hai, van dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet anh - canh thanh toan thong cong hoan ((can cau) or (van hau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet anh - canh thanh toan thong cong hoan ((can cau) OR (van hau)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet anh - canh thanh toan thong cong hoan ((can cau) or (van hau))*.