Perhaps you should try some spelling variations:
so sanh » do sanh
sanh ty » sach ty, canh tay
hanh ca » hanh cac, hanh cat, hanh cua
dua ban » dia ban, cua ban, qua ban
duc ban » duc tan, duc van, duc man
ca cua » co cua
cua te » cua tu
ve cam » ve cham, ve cac, va cam
xang o » lang o, tang o, dang o
o hoc » co hoc, mo hoc, so hoc
va co » vo co

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 ty xang o hoc. hieu ((ve cam) or (va co)) ((duc ban) OR (dua ban)) hanh ca cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ty xang o hoc. hieu ((ve cam) OR (va co)) ((duc ban) OR (dua ban)) hanh ca cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ty xang o hoc. hieu ((ve cam) or (va co)) ((duc ban) OR (dua ban)) hanh ca cua te".
• Adding a wildcard symbol may retrieve word variants: so sanh ty xang o hoc. hieu ((ve cam) or (va co)) ((duc ban) OR (dua ban)) hanh ca cua te*.