Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien thuc » trien thuoc, tren thuc, trien thuat
phu thong » pho thong, phap thong, khau thong
sach bai » sach dao, cac bai, sach xa
bai thuc » bai thuoc, bao thuc, dai thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan khoa » dang khoa, san khoa, van khoa
khoa phu » khoa phau, khoa thu, hoa phu
khoa hoa » khoa khoa, khoa hoc, khoa hoi
hoa cong » cua cong, va cong, hoa co
tu sach » thu sach, su sach, tu cach
te sach » toc sach
thuc da » thuc day, thuc dia, thuc va

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 bai thuc dan khoa phu thong ) or ( te sach trien thuc da khoa hoa cong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach bai thuc dan khoa phu thong ) OR ( te sach trien thuc da khoa hoa cong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach bai thuc dan khoa phu thong ) or ( te sach trien thuc da khoa hoa cong ))*.