Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
hanh trinh » canh tranh, hanh chinh
nghien tin » nghiem tin, nghiem tinh, nghiem tien
thuat sach » thuat lanh, thuat san
sach tranh » canh tranh
nghiem du » nghiem dau, nghiem de, nghiem su
nghiem d » nghiem de, nghiem _, nghiem h
tu hanh » du hanh, lu hanh, thuc hanh
tin hoc » sinh hoc

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 nghien tin hoc ) or ( thuat sach tranh ((nghiem du) or (nghiem d)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu hanh trinh nghien tin hoc ) OR ( thuat sach tranh ((nghiem du) OR (nghiem d)) hoc )).
• Adding a wildcard symbol may retrieve word variants: (( tu hanh trinh nghien tin hoc ) or ( thuat sach tranh ((nghiem du) or (nghiem d)) hoc ))*.