Perhaps you should try some spelling variations:
tren thuc » trien thuc, tron thuc, trinh thuc
sanh tren » sach tren, lanh tren, sinh tren
sach tri » sach tai, sach tren, sach truc
tue bach » truc bach, thi bach, vu bach
he trong » he thong, he trung, le trong
thuc van » thuc vat, thuc dan, thuc va
so sach » bo sach, co sach, hoc sach
bach ha » bac ha, bich ha, sach ha
so sanh » do sanh
ha he » ha le, va he
hoa » khoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach tri tue bach ha he trong ) or ( so sanh tren thuc van hoa he trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach tri tue bach ha he trong ) OR ( so sanh tren thuc van hoa he trong )).
• Adding a wildcard symbol may retrieve word variants: (( so sach tri tue bach ha he trong ) or ( so sanh tren thuc van hoa he trong ))*.