Perhaps you should try some spelling variations:
thanh hang » thanh hoang, thanh thang, thanh hung
tranh hang » trinh han, tran hoang, tran hong
cho thuc » choi thuc, cho thue, co thuc
ca chang » ca chung, co chang, san chang
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap
ca hang » cua hang, va hang, ca tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: cho thuc hanh - ((thanh hang) or (tranh hang)) ((ca hang) OR (ca chang)) cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho thuc hanh - ((thanh hang) OR (tranh hang)) ((ca hang) OR (ca chang)) cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cho thuc hanh - ((thanh hang) or (tranh hang)) ((ca hang) OR (ca chang)) cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: cho thuc hanh - ((thanh hang) or (tranh hang)) ((ca hang) OR (ca chang)) cong dan toan cau*.