Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
sach trinh » sach tranh, hanh trinh, sach kinh
thiet noi » thiet bi, thieu nhi, nhiet doi
thiet dia » thiet bi, hieu dia, thien bia
noi hoc » hoi hoc, voi hoc, noi khoa
tu sach » thu sach, su sach, te sach
tu lap » truc lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu lap trinh thiet noi hoc ) or ( tu sach trinh thiet dia oc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu lap trinh thiet noi hoc ) OR ( tu sach trinh thiet dia oc )).
• Adding a wildcard symbol may retrieve word variants: (( tu lap trinh thiet noi hoc ) or ( tu sach trinh thiet dia oc ))*.