Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
nhung cong » dung cong, thong cong, hang cong
manh cua » doanh cua
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap
ban cua » ban quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuyet ((thiet tach) OR (thuat tach)) - canh ((manh cua) or (ban cua)) nhung cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuyet ((thiet tach) OR (thuat tach)) - canh ((manh cua) OR (ban cua)) nhung cong tan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuyet ((thiet tach) OR (thuat tach)) - canh ((manh cua) or (ban cua)) nhung cong tan than cau".
• Adding a wildcard symbol may retrieve word variants: thuyet ((thiet tach) OR (thuat tach)) - canh ((manh cua) or (ban cua)) nhung cong tan than cau*.