Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh tang » hanh trang, anh tang, hanh mang
hieu van » hieu va, thien van, lieu va
cua dang » cua ban
cong dan » cong san, cong tan, huong dan
dan thai » dang thai, dan thi, dan than
thai cao » tai cao, thoai cac, thuat cao

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

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