Perhaps you should try some spelling variations:
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thiet anh » thien anh, thuyet anh, thien danh
chinh can » chinh ca, chinh ban, chinh cau
dung cong » dung trong
thanh lap » thanh san, phan lap, thanh hai
can dung » chan dung, van dung, dan dung
cong dan » cong san, cong tan, huong dan
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 anh - hanh chinh can dung cong dan ((khan cap) or (thanh lap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet anh - hanh chinh can dung cong dan ((khan cap) OR (thanh lap)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet anh - hanh chinh can dung cong dan ((khan cap) or (thanh lap))*.