Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
hoc thieu » toc thieu, hoc hien
thong cua » thong quan, thong tu, huong cua
dang cong » dung cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan 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 thieu tinh - hanh ((thong xay) or (thong cua)) dang cong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - hanh ((thong xay) OR (thong cua)) dang cong dan than tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - hanh ((thong xay) or (thong cua)) dang cong dan than tap*.