Perhaps you should try some spelling variations:
khoan phau » khoa phau, khoan phai, khoa chau
phau thong » phap thong, khau thong, phan thong
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
pho thong » he thong
thuc cac » thuc cach, tuc cac, phuc cac
sach dao » lanh dao
tuc hanh » thuc hanh, tuc thanh, duc hanh
khoa pho » khoa phu, khoa khoa, khoa phau
tu sach » thu sach, su sach, te sach
vu sach » vu bach, su sach, vu khach
dao tuc » dao duc

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 tren thuc cac khoan phau thong ) or ( vu sach dao tuc hanh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tren thuc cac khoan phau thong ) OR ( vu sach dao tuc hanh khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tren thuc cac khoan phau thong ) or ( vu sach dao tuc hanh khoa pho thong ))*.