Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
cong ngang » cong nhan, cong quang, cong lang
hoc chieu » hoc thieu, ho chieu, hoc hien
truong va » truong dai, truong cao, truong dao
cong vang » cong lang, cong quang, cong san
trung va » trang va, trung ha, trung tam
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: hoc chieu xanh - hanh ((trung va) OR (truong va)) nhung ((cong vang) or (cong ngang)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - hanh ((trung va) OR (truong va)) nhung ((cong vang) OR (cong ngang)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu xanh - hanh ((trung va) OR (truong va)) nhung ((cong vang) or (cong ngang)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - hanh ((trung va) OR (truong va)) nhung ((cong vang) or (cong ngang)) toan cau*.