Perhaps you should try some spelling variations:
thiet tach » chiet tach
thuat tach » thuat sach, thuat mach, thuat tac
thien hach » thien thanh, hien hanh
hanh trang » thanh trung, canh tranh, hanh trinh
trang van » tran van, trang va, trong van
trong dan » trong dang, trong san, trong tan
van dung » van dong, xay dung, tin dung
dan toan » van toan, dan than, manh toan
toan cau » 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 (thuat tach))) or (thien hach)) - hanh trang van dung trong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((thiet tach) OR (thuat tach))) OR (thien hach)) - hanh trang van dung trong dan toan cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((thiet tach) OR (thuat tach))) or (thien hach)) - hanh trang van dung trong dan toan cau*".