Perhaps you should try some spelling variations:
khoan phai » khong phai, khoa phau, khoan hoi
phai tuong » phan thuong, pham thuong, pham truong
phu thong » pho thong, phap thong, khau thong
ban thuoc » dang thuoc, cay thuoc, nam thuoc
thuoc dac » thuoc dang, thuoc sach, thuc dan
dac khoan » cac khoan, dac khoa, dai khoang
sach ban » sach bai, sach han, sach bac
hoc sach » hoc sinh, hoc cac, hoc anh
sach hoa » sach ha, sach hoi, bach hoa
te sach » toc sach
ban hoc » bang hoc, van hoc, bai hoc
hoa phu » khoa phu, hoa phi, hoi phu

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 ban hoc sach hoa phu thong ) or ( te sach ban thuoc dac khoan phai tuong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach ban hoc sach hoa phu thong ) OR ( te sach ban thuoc dac khoan phai tuong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach ban hoc sach hoa phu thong ) or ( te sach ban thuoc dac khoan phai tuong ))*.