Perhaps you should try some spelling variations:
trinh nghien » trinh nghe, kinh nghiem, trinh thiet
trach nhiem » trac nghiem
hanh trinh » canh tranh, hanh chinh
thuat sach » thuat lanh, thuat san
nghien de » nghiem de, nghiep ke, nghiem d
nhiem dai » nhien dai, nhiem tai, nghiep dai
thu sach » tu sach, thuoc sach, thu hoach
ly hanh » ly anh, ly hang, lu hanh
de hoc » te hoc, du hoc, dien hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ly hanh trinh nghien de hoc ) or ( ((thu sach) or (thuat sach)) trach nhiem dai hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ly hanh trinh nghien de hoc ) OR ( ((thu sach) OR (thuat sach)) trach nhiem dai hoc )).
• Adding a wildcard symbol may retrieve word variants: (( ly hanh trinh nghien de hoc ) or ( ((thu sach) or (thuat sach)) trach nhiem dai hoc ))*.