Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sanh » do sanh
sanh ty » sach ty, canh tay
xuc cac » xuc tac, tuc cac, xuc cam
cac xuc » cam xuc, cac nuoc, chat xuc
van cac » van hac, van cau, van bac
cua tre » cua te, cuu tre, cua triet
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua

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 ((nang x) or (((nang ma) or (sang ma)))) hoi. hieu van cac xuc cac dan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ty ((nang x) OR (((nang ma) OR (sang ma)))) hoi. hieu van cac xuc cac dan vi cua tre.
• Adding a wildcard symbol may retrieve word variants: so sanh ty ((nang x) or (((nang ma) or (sang ma)))) hoi. hieu van cac xuc cac dan vi cua tre*.