Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hoc chinh » hoan chinh, hoc sinh, hoc kinh
trinh va » trinh van, trinh vat, trinh ve
cong san » cong tac
san can » san van, ban can, san chang
can ban » van ban, toan 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 chinh) or (do dinh)) sach - hanh trinh va nhung cong san can ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc chinh) OR (do dinh)) sach - hanh trinh va nhung cong san can ban.
• Adding a wildcard symbol may retrieve word variants: ((hoc chinh) or (do dinh)) sach - hanh trinh va nhung cong san can ban*.