Perhaps you should try some spelling variations:
truong cong » truong dong, truong long, truong chung
chieu xanh » chieu sach, chieu sang, chieu tinh
canh trinh » canh tranh, hanh trinh, canh tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
trinh cac » trinh cau, trinh chat, trinh chao
than cau » phan cau, than cap, thanh chau
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 - canh trinh cac ((truong cong) or (trong cong)) dan ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - canh trinh cac ((truong cong) OR (trong cong)) dan ((than cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - canh trinh cac ((truong cong) or (trong cong)) dan ((than cau) or (toan cau))*.