Perhaps you should try some spelling variations:
sanh tren » sach tren, lanh tren, sinh tren
tren thuc » trien thuc, tron thuc, trinh thuc
pho thong » he thong
thuc day » thuc dan, thuc vat
day khoa » da khoa, may khoa, dac khoa
khoa pho » khoa phu, khoa khoa, khoa phau
khac hoc » khac phuc, khac cuoc, khoa hoc
hoc thuc » hoc huu
so sanh » do sanh
vu khac » vu kham, vu khanh, bui khac

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 day khoa pho thong ) or ( vu khac hoc thuc day khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tren thuc day khoa pho thong ) OR ( vu khac hoc thuc day khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tren thuc day khoa pho thong ) or ( vu khac hoc thuc day khoa pho thong ))*.