Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu sang » chieu sach, chieu xanh, nhieu tang
trinh suat » trinh luat, trinh sat, trinh quan
thong cong » trong cong, tong cong, phong chong
hieu lang » hieu quang, nhieu tang, hieu van
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: ho ((chieu sang) or (hieu lang)) - hanh trinh suat ((thong cong) OR (thong thong)) dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - hanh trinh suat ((thong cong) OR (thong thong)) dan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu lang)) - hanh trinh suat ((thong cong) OR (thong thong)) dan than cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - hanh trinh suat ((thong cong) OR (thong thong)) dan than cau*.