Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
tranh cua » doanh cua, manh cua
dang nong » dang cong, hang nong, tang nong
cua dang » cua cong, cua ban
menh van » dinh van, nen van, minh va
benh va » benh ve, benh dai, benh 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)) - hanh tranh cua dang nong ((menh van) or (benh va)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - hanh tranh cua dang nong ((menh van) OR (benh va)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) OR (hieu lang)) - hanh tranh cua dang nong ((menh van) or (benh va)) ban".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) OR (hieu lang)) - hanh tranh cua dang nong ((menh van) or (benh va)) ban*.