Perhaps you should try some spelling variations:
sach trinh » sach tranh, hanh trinh, sach kinh
tranh thai » trang thai, tran thi, tinh thai
thai dien » thai den, thau dien, thuat dien
dien hoc » dien hoa, khien hoc, tin hoc
te sach » toc sach
nghe di » nghe vi, nghe dien, nghe noi
tu canh » thu canh, tu chanh, tu can

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

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