Perhaps you should try some spelling variations:
sach tranh » canh tranh
thuoc sach » hoc sach, nuoc sach, thuat sach
tranh thu » tran thu, thanh thu, thanh thuy
canh khoa » anh khoa, xanh khoa, doanh khoa
sach tri » sach tai, sach tren, sach truc
tri thuc » tri tue
thuc cac » thuc cach, tuc cac, phuc cac
cac khoa » cac khoan, cac khoi, dac khoa
khoa pho » khoa phu, khoa khoa, khoa phau
thu canh » thuc hanh, thu cong, thu ban
te sach » toc sach
khoa he » hoa he, khoa hoc, khong he

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( thuoc sach tri thuc cac khoa pho thong ) or ( te sach tranh thu canh khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thuoc sach tri thuc cac khoa pho thong ) OR ( te sach tranh thu canh khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( thuoc sach tri thuc cac khoa pho thong ) or ( te sach tranh thu canh khoa he thong ))*.