Perhaps you should try some spelling variations:
trinh nghiep » trinh nghien, trinh nghe, trinh ghep
trinh thien » trinh thiet, trinh tien, trinh nghien
hanh trinh » canh tranh, hanh chinh
nghiep dan » nghiep can, nghiep dai, nghiep van
thien van » thi van
tu hanh » du hanh, lu hanh, thi 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 trinh nghiep dan toc ) or ( thuc hanh trinh thien van hoa ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hanh trinh nghiep dan toc ) OR ( thuc hanh trinh thien van hoa )).
• Adding a wildcard symbol may retrieve word variants: (( tu hanh trinh nghiep dan toc ) or ( thuc hanh trinh thien van hoa ))*.