Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
manh trung » manh tung, thanh trung, manh hung
hoc thiet » hoc thieu, hoc thuyet, hoc hien
van thanh » ban thanh, van tuan
cap dung » ap dung, cao dung, chan dung
dan dung » van dung, tin dung, ap dung
van toan » van tuan, van tan, manh toan

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 - manh trung ((cap dung) or (dan dung)) dang ((van toan) OR (van thanh)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - manh trung ((cap dung) OR (dan dung)) dang ((van toan) OR (van thanh)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - manh trung ((cap dung) or (dan dung)) dang ((van toan) OR (van thanh)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - manh trung ((cap dung) or (dan dung)) dang ((van toan) OR (van thanh)) cao*.