Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
thong tan » thong than, thong tran, thong van
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (hieu lang)) - manh trung cua thong ((thong tan) OR (thong tin)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - manh trung cua thong ((thong tan) OR (thong tin)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu lang)) - manh trung cua thong ((thong tan) OR (thong tin)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - manh trung cua thong ((thong tan) OR (thong tin)) toan cau*.