Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
trung hoc » trung quoc
chi sang » chi lang, chieu sang, chi chang
cong ban » cong bang, cong san, cong tan
phan cau » phan dau, phan cac, phan tu
doi chi » doi khi
tung ha » trung ha, dung ha, tung ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sang - thanh ((tung ha) or (trung hoc)) nhung ((cong ban) or (cong thanh)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - thanh ((tung ha) OR (trung hoc)) nhung ((cong ban) OR (cong thanh)) phan cau.
• Adding a wildcard symbol may retrieve word variants: doi chi sang - thanh ((tung ha) or (trung hoc)) nhung ((cong ban) or (cong thanh)) phan cau*.