Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trinh » canh tranh, hanh chinh
chong cong » cong cong, thong cong, cuong cong
hien xanh » hien hanh, hien nhanh, chieu xanh
trinh hoa » trinh do, trinh han
san toan » van toan, dan toan, manh toan
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien xanh) or (chieu tinh)) - hanh trinh hoa ((chong cong) or (trong cong)) san toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (chieu tinh)) - hanh trinh hoa ((chong cong) OR (trong cong)) san toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (chieu tinh)) - hanh trinh hoa ((chong cong) or (trong cong)) san toan ban*.