Perhaps you should try some spelling variations:
thanh trung » thanh tung
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
cung tap » cuong tap, cung cap, cung tai
toan cao » toan ban, toan tap
cung ta » chung ta, cung tai, cung tan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chieu sang) or (hieu lang)) - thanh trung cua thong ((cung tap) or (cung ta)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sang) OR (hieu lang)) - thanh trung cua thong ((cung tap) OR (cung ta)) toan cao.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sang) or (hieu lang)) - thanh trung cua thong ((cung tap) or (cung ta)) toan cao*.