Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
trinh thien » trinh thiet, trinh tien, trinh tin
hanh trinh » canh tranh, hanh chinh
nghien dan » nghiep dan, nghe dan, nghia dan
thien van » thi van
thi hanh » thi thanh
tu hanh » du hanh, lu hanh, luu hanh
hoa » khoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((tu hanh) OR (thi hanh)) trinh nghien dan toc ) or ( thuc hanh trinh thien van hoa ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tu hanh) OR (thi hanh)) trinh nghien dan toc ) OR ( thuc hanh trinh thien van hoa )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((tu hanh) OR (thi hanh)) trinh nghien dan toc ) or ( thuc hanh trinh thien van hoa ))".
• Adding a wildcard symbol may retrieve word variants: (( ((tu hanh) OR (thi hanh)) trinh nghien dan toc ) or ( thuc hanh trinh thien van hoa ))*.