Perhaps you should try some spelling variations:
khoan khau » khoanh khac, khoa kham, khoa phau
khau thong » khau thuong, khap thong, khau tong
pho thong » he thong
sach thu » sach thue, sach thieu, sach tham
cua khoa » chua khoa, sua khoa, qua khoa
khoa pho » khoa phu, khoa khoa, khoa phau
thuc cac » thuc cach, tuc cac, phuc cac
te sach » toc sach
thu hoc » tu hoc, thu hoi, tru hoc
tu thuc » tu thuoc, thu thuc, tu thu
te anh » te danh, tue anh, le anh
anh tu » anh tuan

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 thu hoc cua khoa pho thong ) or ( te anh tu thuc cac khoan khau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach thu hoc cua khoa pho thong ) OR ( te anh tu thuc cac khoan khau thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach thu hoc cua khoa pho thong ) or ( te anh tu thuc cac khoan khau thong ))*.