Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
chieu sang » chieu sach, chieu xanh, nhieu tang
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hieu lang » nhieu tang, hieu van, biet lang
dan chinh » dang chinh, lan chinh, van chinh
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, huong dan
chinh ca » chinh ta, chinh va, chinh tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sang) or (((hieu lang) OR (hieu quang)))) - hanh trinh va nhung cong dan chinh ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (((hieu lang) OR (hieu quang)))) - hanh trinh va nhung cong dan chinh ca.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) or (((hieu lang) OR (hieu quang)))) - hanh trinh va nhung cong dan chinh ca".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (((hieu lang) OR (hieu quang)))) - hanh trinh va nhung cong dan chinh ca*.