Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
cong ngang » cong quang, cong lang, cong nong
hoc chieu » hoc thieu, ho chieu, hoc hien
cong nhan » cong nhat, cong thanh, cong san
quang cao » nang cao, quang nam
trung ha » trung hoc, trung tam, trung cap
ha nhung » hoa nhung, hay nhung, pha nhung

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 xanh - thanh trung ha nhung ((cong ngang) or (cong nhan)) quang cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - thanh trung ha nhung ((cong ngang) OR (cong nhan)) quang cao.
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - thanh trung ha nhung ((cong ngang) or (cong nhan)) quang cao*.