Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh tran » hanh trang, thanh tran, hanh tram
tuong dan » huong dan, tung dan, truong dai
xuong dan » huong dan, xuong san, nguong dan
tran van » luan van
van hung » van dung, manh hung, van duong
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 - hanh tran van hung ((tuong dan) or (xuong dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh tran van hung ((tuong dan) OR (xuong dan)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh tran van hung ((tuong dan) or (xuong dan)) toan cao*.