Perhaps you should try some spelling variations:
phan thong » phan thuong, phan hong, phan tong
thuat mach » thuat sach, thuat tach, thuyet mach
sinh nghe » sinh ngheo, tinh nghe, vinh nghe
pho thong » he thong
cac thuat » va thuat, hoc thuat, cac thu
mach khoa » bach khoa, anh khoa, may khoa
khoa phan » hoa phan, khoa than, khoa phau
sanh tai » sang tai, hanh tai, anh tai
nghe pho » nghe cho, nghe phan, nghe khoa
lanh cac » hanh cac, quanh cac, thanh cac
so sanh » do sanh
tai hoc » thai hoc, dai hoc, bai hoc
tu lanh » tu hanh, tu lenh, tu manh

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 tai hoc sinh nghe pho thong ) or ( tu lanh cac thuat mach khoa phan thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tai hoc sinh nghe pho thong ) OR ( tu lanh cac thuat mach khoa phan thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tai hoc sinh nghe pho thong ) or ( tu lanh cac thuat mach khoa phan thong ))*.