Perhaps you should try some spelling variations:
thiet tach » thien hach
chiet tach » chieu sach
thuat tach » thuat sach, thuat mach, thuat tac
hanh tran » hanh trang, thanh tran, hanh tram
dung cong » dung trong
tran van » luan van
van dung » van dong, xay dung, tin dung
cong dan » cong san, cong tan, huong dan
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 (chiet tach))) or (thuat tach)) - hanh tran van dung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((thiet tach) OR (chiet tach))) OR (thuat tach)) - hanh tran van dung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((((thiet tach) OR (chiet tach))) or (thuat tach)) - hanh tran van dung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((((thiet tach) OR (chiet tach))) or (thuat tach)) - hanh tran van dung cong dan toan cau*.