Perhaps you should try some spelling variations:
truong thanh » truong trung, truong thpt, truong chung
chieu sang » chieu sach, chieu xanh, hieu lang
cong thanh » dong thanh, cong trinh, cong tan
trung tai » truong tai, trung dai, trong tai
ho chieu » theo chieu, hoc thieu, doi chieu
tran cau » tran chau, toan cau, ran cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - hanh ((trung tai) OR (trung tam)) tong ((cong thanh) or (truong thanh)) tran cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu sang - hanh ((trung tai) OR (trung tam)) tong ((cong thanh) OR (truong thanh)) tran cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - hanh ((trung tai) OR (trung tam)) tong ((cong thanh) or (truong thanh)) tran cau".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - hanh ((trung tai) OR (trung tam)) tong ((cong thanh) or (truong thanh)) tran cau*.