Perhaps you should try some spelling variations:
hoc thien » hoc hien, hoc thiet, hoc tien
hoc thieu » toc thieu, hoc hien
chinh vat » chinh va, chinh dat, chinh viet
vat dung » van dung, va dung, viet dung
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
chan cau » phan cau, can cau, chinh cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thien) or (hoc thieu)) anh - hanh chinh vat dung ((cong dan) OR (cong san)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thien) OR (hoc thieu)) anh - hanh chinh vat dung ((cong dan) OR (cong san)) chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thien) or (hoc thieu)) anh - hanh chinh vat dung ((cong dan) OR (cong san)) chan cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thien) or (hoc thieu)) anh - hanh chinh vat dung ((cong dan) OR (cong san)) chan cau*.