Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, chau tinh, kieu tinh
hanh trinh » canh tranh, hanh chinh
dong thanh » truong thanh
lieu tinh » trieu tinh, diep tinh, bien tinh
trinh su » trinh tu, trinh san, trinh cau
cong tan » cong tac, cong san, cong thanh
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 ((chieu tinh) or (lieu tinh)) - hanh trinh su dung ((dong thanh) or (cong tan)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu tinh) OR (lieu tinh)) - hanh trinh su dung ((dong thanh) OR (cong tan)) toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) or (lieu tinh)) - hanh trinh su dung ((dong thanh) or (cong tan)) toan ban*.