Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
nghiem dien » nghiep dien, nghiem tieng, nhiet dien
nghiem tien » nghiem tieng, nghiem tin, nghiem tren
sach trinh » sach tranh, hanh trinh, sach kinh
sach truc » cach thuc, sach tren, sach thu
thiet te » thiet ke, thiet de, thiet yeu
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach trinh thiet te hoc ) or ( su sach truc ((nghiem dien) OR (nghiem tien)) hoc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach trinh thiet te hoc ) OR ( su sach truc ((nghiem dien) OR (nghiem tien)) hoc )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( su sach trinh thiet te hoc ) or ( su sach truc ((nghiem dien) OR (nghiem tien)) hoc ))".
• Adding a wildcard symbol may retrieve word variants: (( su sach trinh thiet te hoc ) or ( su sach truc ((nghiem dien) OR (nghiem tien)) hoc ))*.