Perhaps you should try some spelling variations:
thiet tach » thien hach, thuat tach
chiet tach » chieu sach
thanh tung » thanh cong
cap hang » cap hoang, cap bang, cau thang
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan cau » toan cao, toan ban, toan tap
cap han » cap phan, cap can, cap hay

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 tach) or (chiet tach)) - thanh tung ((cap hang) or (cap han)) cong san toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (chiet tach)) - thanh tung ((cap hang) OR (cap han)) cong san toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (chiet tach)) - thanh tung ((cap hang) or (cap han)) cong san toan cau*.