Perhaps you should try some spelling variations:
phan thong » phan thuong, phan hong, phan tong
sanh tren » lanh tren, sinh tren, doanh tren
tren thuc » trien thuc, tron thuc, trinh thuc
hanh khoa » hang khoa, anh khoa, hanh hoa
pho thong » he thong
sach tren » sach tien, sach tranh
khoa pho » khoa phu, khoa khoa, khoa phau
tren tuc » trong tuc, tren thi, lien tuc
hoa phan » hoa dan, co phan
so sanh » do sanh
tu sach » thu sach, su sach, te sach
tuc cac » tu cac, tich cac
cac hoa » cac hoat, cac khoa, cau hoa

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

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