Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach
thuat tach » thuat sach, thuat mach, thuat tac
thanh tran » thanh trang, thanh toan, thanh tra
dung cong » dung trong
tran xay » tra xay, tran day, trinh xay
tan toan » tan tran, tap toan, van toan
van tuan » van quan, van ban, anh tuan

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 (thuat tach)) - thanh tran xay dung cong ((tan toan) or (van tuan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thuat tach)) - thanh tran xay dung cong ((tan toan) OR (van tuan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (thuat tach)) - thanh tran xay dung cong ((tan toan) or (van tuan)) cau*.