Perhaps you should try some spelling variations:
trien thuoc » trien thuc, trien thuong, tin thuoc
sach trien » sach tien, sach tren, sach thieu
khoan phau » khoa phau, khoan phai, khoa chau
phau thong » phap thong, khau thong, phan thong
thuoc cac » thuoc cuc, thuoc cao, thuoc dac
anh khoa » doanh khoa, hang khoa
tu sach » thu sach, su sach, te sach
cac thu » cach thuc, cac thoi
tuc anh » tuc hanh, duc anh, tu anh
khoa he » hoa he, khoa hoc, khong he

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 trien thuoc cac khoan phau thong ) or ( tu cac thu tuc anh khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach trien thuoc cac khoan phau thong ) OR ( tu cac thu tuc anh khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach trien thuoc cac khoan phau thong ) or ( tu cac thu tuc anh khoa he thong ))*.