Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
hoc thiet » hoc thieu, toc thieu, hoc viet
chinh can » chinh ca, chinh ban, chinh cau
dung cong » dung trong
can dung » chan dung, van dung, dan dung
cong dan » cong san, cong tan, huong dan
dan khan » dan khanh, dan chan, dan than
khan cap » khan ap, than cap, khoan cam

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) OR (hoc thuyet))) or (hoc hien)) anh - hanh chinh can dung cong dan khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((hoc thiet) OR (hoc thuyet))) OR (hoc hien)) anh - hanh chinh can dung cong dan khan cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((hoc thiet) OR (hoc thuyet))) or (hoc hien)) anh - hanh chinh can dung cong dan khan cap".
• Adding a wildcard symbol may retrieve word variants: ((((hoc thiet) OR (hoc thuyet))) or (hoc hien)) anh - hanh chinh can dung cong dan khan cap*.