Perhaps you should try some spelling variations:
canh tinh » hanh tinh, manh tinh, canh tranh
sach tich » mach tich, sach kinh, suc tich
toc sach » hoc sach, doc sach, thuoc sach
hoc giao » hoc cao
tich so » tich bao, tinh son
tu canh » thu canh, tu chanh, tu can
tinh so » tinh son, tinh soc, dinh so
so giao » so giai

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( toc sach tich so - hoc giao ) or ( tu canh tinh so - so giao ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( toc sach tich so - hoc giao ) OR ( tu canh tinh so - so giao ))*.