Perhaps you should try some spelling variations:
thieu hanh » thien thanh, thien chanh, thieu khang
hoc thieu » toc thieu, hoc hien
tinh bang » tinh sang, tinh lang, tinh quang
dung cong » dung trong
anh tang » anh bang, anh dang, anh nang
qua dung » quang dung, su dung, qua song
dan toan » van toan, dan than, 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 thieu hanh - ((anh tang) or (tinh bang)) qua dung cong ((dan toan) or (tinh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu hanh - ((anh tang) OR (tinh bang)) qua dung cong ((dan toan) OR (tinh toan)) cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu hanh - ((anh tang) or (tinh bang)) qua dung cong ((dan toan) or (tinh toan)) cao*.