Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, thong thong, phong chong
hieu lang » chieu sang, nhieu tang, hieu van
trinh cua » tinh cua, trinh luat, trinh quan
tong cong » trong cong, cong cong, dung cong
san cua » sang cua, ban cua, dan cua

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

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