Perhaps you should try some spelling variations:
khoan khau » khoanh khac, khoa kham, han khau
phau thong » phap thong, phan thong, phan thuong
khau thong » khau thuong, khap thong, khau tong
thuc hang » thuc hanh, thu hang, phuc hang
hang khoa » dung khoa
khoa phau » hoa phan, khoa kham, khoa than
sanh phat » sach phat, san pham, van phat
phat thuc » phap thuc, pham thuc, phan thuc
thuc cac » thuc cach, tuc cac, phuc cac
tu sach » thu sach, su sach, te sach
sach va » sach xa, sach ha, sach dao
so sanh » do sanh

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 va thuc hang khoa phau thong ) or ( so sanh phat thuc cac khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach va thuc hang khoa phau thong ) OR ( so sanh phat thuc cac khoan khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach va thuc hang khoa phau thong ) or ( so sanh phat thuc cac khoan khau thong ))*.