Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
hanh trinh » canh tranh, hanh chinh
nghiem van » nghiem va, nghiem ban, nghiep van
thiet ban » thien ban, thien bang, thiet bi
lu hanh » luu hanh, du hanh, ly hanh
ban hoc » bang hoc, bai hoc, dan hoc
su sach » vu sach
so sach » so sanh, bo sach, co sach
van hoc » van hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( lu hanh trinh thiet ban hoc ) or ( ((su sach) or (so sach)) trac nghiem van hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( lu hanh trinh thiet ban hoc ) OR ( ((su sach) OR (so sach)) trac nghiem van hoc )).
• Adding a wildcard symbol may retrieve word variants: (( lu hanh trinh thiet ban hoc ) or ( ((su sach) or (so sach)) trac nghiem van hoc ))*.