Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
cho tuyen » tho tuyen, cho chuyen, so tuyen
canh tinh » hanh tinh, manh tinh, canh tranh
dung cong » dung trong
ho tuyen » ho truyen, hoc tuyen, hop tuyen
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap
tinh va » tich va, trinh van, trinh vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho tuyen) or (cho tuyen)) tinh - canh tinh va ((nhung cong) OR (dung cong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho tuyen) OR (cho tuyen)) tinh - canh tinh va ((nhung cong) OR (dung cong)) van toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho tuyen) or (cho tuyen)) tinh - canh tinh va ((nhung cong) OR (dung cong)) van toan cao".
• Adding a wildcard symbol may retrieve word variants: ((ho tuyen) or (cho tuyen)) tinh - canh tinh va ((nhung cong) OR (dung cong)) van toan cao*.