Perhaps you should try some spelling variations:
sach tranh » canh tranh
phau thong » phap thong, khau thong, phan thong
tranh thuc » trinh thuc, trang thuc, thanh thuy
khoa phau » hoa phan, khoa than, khoa thu
thuc cach » thuoc sach, truoc cach, thuc hanh
cach khoa » bach khoa, cac khoan, anh khoa
khoa kham » kho khan, khoa than
kham tong » khau tong, pham trong, khac trong
sach dai » sach dao, sach bai, sach dat
dai thuc » dan thuc, dai thu, dai thua
thuc cac » tuc cac, phuc cac, thac cac
cac khoa » cac khoan, cac khoi, dac khoa
hoc sach » hoc sinh, hoc cac, hoc anh
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach dai thuc cac khoa phau thong ) or ( hoc sach tranh thuc cach khoa kham tong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dai thuc cac khoa phau thong ) OR ( hoc sach tranh thuc cach khoa kham tong ))*.