Perhaps you should try some spelling variations:
sang ma » tang ma, nang ma, sang tao
hieu va » lieu va, hieu qua
hieu ve » hieu van
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
sinh y » sinh ly
y sang » _ sang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa
xuc va » tuc va, luc va, xac va
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sinh y sang ma hoi. ((hieu va) or (hieu ve)) cam ((xuc va) or (duc va)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sinh y sang ma hoi. ((hieu va) OR (hieu ve)) cam ((xuc va) OR (duc va)) hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc sinh y sang ma hoi. ((hieu va) or (hieu ve)) cam ((xuc va) or (duc va)) hanh va cua tre*.