Perhaps you should try some spelling variations:
trinh thiet » trinh viet, trinh thi
trinh dien » tinh dien, trinh tin
sach trinh » sach tranh, hanh trinh, sach kinh
te hanh » te thanh, tu hanh, ve hanh
tu sach » thu sach, su sach, te sach
tu hoc » te hoc
ke hoc » te hoc, de hoc, ke ho

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

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