Perhaps you should try some spelling variations:
thiet tach » chiet tach, thuat tach
thien hach » thien thanh, hien hanh
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
tran xay » tra xay, tran day, trinh xay
toan cao » toan ban, toan tap

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 (thien hach)) - hanh tran xay dung cong manh toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thien hach)) - hanh tran xay dung cong manh toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) or (thien hach)) - hanh tran xay dung cong manh toan cao*.