Perhaps you should try some spelling variations:
khoan phap » khoan phai, khoa phau, han phap
phap thong » phap phong, phap chong, pho thong
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
thuc sinh » thuoc sinh, thu sinh, thuc kinh
sinh khoa » sinh hoc, sinh hoat, anh khoa
sach tai » sach bai, sach tham, sach dao
tai thuc » thai thuc, tri thuc, dai thuc
thuc cac » thuc cach, tuc cac, phuc cac
su sach » so sach, vu sach
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: (( su sach tai thuc cac khoan phap thong ) or ( su sach trien thuc sinh khoa he thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach tai thuc cac khoan phap thong ) OR ( su sach trien thuc sinh khoa he thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach tai thuc cac khoan phap thong ) or ( su sach trien thuc sinh khoa he thong ))*.