Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh vat » trinh van, trinh luat, sinh vat
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
vat dung » van dung, va dung, viet dung
san chan » san chang, dan chan, ban chan
san chay » san pham, van chat, dan chan
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chi) or (doc hieu)) sach - hanh trinh vat dung cong ((san chan) OR (san chay)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chi) OR (doc hieu)) sach - hanh trinh vat dung cong ((san chan) OR (san chay)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doi chi) or (doc hieu)) sach - hanh trinh vat dung cong ((san chan) OR (san chay)) ban".
• Adding a wildcard symbol may retrieve word variants: ((doi chi) or (doc hieu)) sach - hanh trinh vat dung cong ((san chan) OR (san chay)) ban*.