Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu sach » chieu sach, hieu cach, dien sach
hang cong » dang cong, hang nong, bang cong
quang cao » quang cua
doc hieu » toc thieu, hoc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
cong van » cong vang, cong san, song van
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: doc hieu sach - hanh trinh va hang cong van ((((quang cao) OR (nang cao))) or (quang nam))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu sach - hanh trinh va hang cong van ((((quang cao) OR (nang cao))) OR (quang nam)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu sach - hanh trinh va hang cong van ((((quang cao) OR (nang cao))) or (quang nam))".
• Adding a wildcard symbol may retrieve word variants: doc hieu sach - hanh trinh va hang cong van ((((quang cao) OR (nang cao))) or (quang nam))*.