Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
hoc thanh » hoc nhanh, hoan thanh, hoc phan
hoc hanh » hoc nhanh, hoc anh, thuc hanh
cong dan » cong san, cong tan, huong dan
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - hanh trung ((hoc hanh) OR (hoc thanh)) cong dan ((toan cau) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - hanh trung ((hoc hanh) OR (hoc thanh)) cong dan ((toan cau) OR (toan cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - hanh trung ((hoc hanh) OR (hoc thanh)) cong dan ((toan cau) or (toan cao))".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - hanh trung ((hoc hanh) OR (hoc thanh)) cong dan ((toan cau) or (toan cao))*.