Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoc chieu » hoc thieu, ho chieu, hoc hien
doi chieu » doc hieu, doi chi, ho chieu
trinh va » trinh van, trinh vat, trinh ve
cong van » cong vang, song van, cong tan
cong san » cong tac
phan tap » phan lap, han tap, pha tap
va hang » van hang, va nang, va lang

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