Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
theo chieu » theo tieu, ho chieu, theo chu
chieu sang » chieu sach, chieu xanh, hieu lang
hung tuan » hung tran, quang tuan, trung tuan
cac toan » cac khoan, hach toan, cac thanh
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: theo chieu sang - manh ((hung tuan) or (quang thanh)) dung trong cac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sang - manh ((hung tuan) OR (quang thanh)) dung trong cac toan cau.
• Adding a wildcard symbol may retrieve word variants: theo chieu sang - manh ((hung tuan) or (quang thanh)) dung trong cac toan cau*.