Perhaps you should try some spelling variations:
phau thong » phap thong, khau thong, phan thong
khoan phau » khoan phai, khoa chau, khoa phu
ban thuoc » dang thuoc, cay thuoc, nam thuoc
thuoc cao » thuoc co, thuc cao, thuoc bao
cao khoan » cac khoan, cao khoa, tao khoang
sach truc » cach thuc, sach tren, sach thu
truc thuc » truc thuoc, thuc thuc, truc thuy
thuc bach » truc bach, thuc cach, thuoc sach
bach khoa » anh khoa
khoa phau » hoa phan, khoa kham, khoa than
can ban » van ban, toan ban
tu sach » thu sach, su sach, te sach
tu can » tu ban, tu cac, thu canh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu can ban thuoc cao khoan phau thong ) or ( tu sach truc thuc bach khoa phau thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu can ban thuoc cao khoan phau thong ) OR ( tu sach truc thuc bach khoa phau thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu can ban thuoc cao khoan phau thong ) or ( tu sach truc thuc bach khoa phau thong ))*.