Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hieu xanh » chieu xanh, hieu manh, hieu nganh
doc hieu » toc thieu, hoc thieu, hoc hien
van dung » xay dung, tin dung
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than ban » thanh ban, toan ban, than man

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 xanh - hanh trinh ((van dung) OR (van dong)) cong van than ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh trinh ((van dung) OR (van dong)) cong van than ban".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh trinh ((van dung) OR (van dong)) cong van than ban*.