Perhaps you should try some spelling variations:
hanh khoa » hang khoa, anh khoa, hanh hoa
sach tren » sach tien, sach tranh
tren thuc » trien thuc, tron thuc, trinh thuc
pho thong » he thong
bai thuc » bai thuoc, bao thuc, dai thuc
khoa hoc » hoa hoc
hoc hong » hoc huong, hoc khong, hoc cong
khoa pho » khoa phu, khoa khoa, khoa phau
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu cac bai thuc hanh khoa hoc hong ) or ( tu sach tren thuc hanh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu cac bai thuc hanh khoa hoc hong ) OR ( tu sach tren thuc hanh khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu cac bai thuc hanh khoa hoc hong ) or ( tu sach tren thuc hanh khoa pho thong ))*.