Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu xanh » chieu sach, chieu sang, chieu tinh
hoc chieu » hoc thieu, ho chieu, hoc hien
hinh sinh » tinh sinh, hinh dinh, hinh kinh
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
san toan » dan toan, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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 - ((hinh sinh) or (hanh trinh)) cua dung cong ((san toan) OR (van toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu xanh - ((hinh sinh) OR (hanh trinh)) cua dung cong ((san toan) OR (van toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu xanh - ((hinh sinh) or (hanh trinh)) cua dung cong ((san toan) OR (van toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc chieu xanh - ((hinh sinh) or (hanh trinh)) cua dung cong ((san toan) OR (van toan)) cao*.