Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
luat dung » suat dung, luat chung, luat quang
dung cong » dung trong
cong do » cuong do, cong dot, cong so
do van » dao van, vo van, so van

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu nganh) OR (chiet tach)) - hanh trinh luat dung cong do van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu nganh) OR (chiet tach)) - hanh trinh luat dung cong do van ban".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu nganh) OR (chiet tach)) - hanh trinh luat dung cong do van ban*.