Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
sach trinh » sach tranh, hanh trinh, sach kinh
thiet dia » thiet bi, hieu dia, thien bia
noi khoa » ngoai khoa, hoc khoa, tai khoa
noi hoc » hoi hoc, voi hoc, loai hoc
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 (noi khoa)) ) 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 (noi khoa)) ) OR ( tu sach trinh thiet dia oc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tu lap trinh thiet ((noi hoc) OR (noi khoa)) ) or ( tu sach trinh thiet dia oc ))".
• Adding a wildcard symbol may retrieve word variants: (( tu lap trinh thiet ((noi hoc) OR (noi khoa)) ) or ( tu sach trinh thiet dia oc ))*.