Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
khau tong » khau thong, khau cong, khau thuong
thuc cach » thuoc sach, truoc cach, thuc hanh
khoa phau » hoa phan, khoa kham, khoa than
sach dao » lanh dao
dao thuc » dan thuc, dao tuc, do thuc
cach toc » cac toc, cach hoc, cach thuc
toc khau » toc thai, toc cham, moc chau
cac khoa » cac khoan, cac khoi, dac khoa
tu sach » thu sach, su sach, te sach
dao tu » dao tuc, dao tru, tao tu

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 dao thuc cach toc khau tong ) or ( tu sach dao tu cac khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach dao thuc cach toc khau tong ) OR ( tu sach dao tu cac khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach dao thuc cach toc khau tong ) or ( tu sach dao tu cac khoa phau thong ))*.