Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
cua dang » cua ban
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu nganh) or (hieu quang)) - hanh trinh ((cua cong) or (cua dang)) cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu nganh) OR (hieu quang)) - hanh trinh ((cua cong) OR (cua dang)) cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu nganh) or (hieu quang)) - hanh trinh ((cua cong) or (cua dang)) cong dan than cau*.