Perhaps you should try some spelling variations:
thanh trung » thanh tung
trang vuong » quang vuong
chieu sang » chieu sach, chieu xanh, nhieu tang
lang thong » lang trong, lang thang, mang thong
hieu lang » hieu quang, nhieu tang, hieu van
trung hoc » trung quoc
thong tu » phong tuc, thong tin, thong ke

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)) - thanh trung hoc ((trang vuong) OR (hoang vuong)) lang thong tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sang) OR (hieu lang)) - thanh trung hoc ((trang vuong) OR (hoang vuong)) lang thong tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sang) or (hieu lang)) - thanh trung hoc ((trang vuong) OR (hoang vuong)) lang thong tu".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sang) or (hieu lang)) - thanh trung hoc ((trang vuong) OR (hoang vuong)) lang thong tu*.