Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
ty dang » ty xang, ky dang, ty hang
cuu tre » cua tre, cau tren, cau treo
dau lai » dao lai, dat lai, dau hai
bach ty » sach ty, xach tay, bach thu
hieu ve » hieu va, hieu van
dang ca » dang cac, dan ca, hang ca
xuc va » duc va, tuc va, xac va
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
ca hoi » cau hoi, cua hoi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach ty dang ca hoi. hieu ve cam ((xuc va) or (luc va)) dau lai ((cuu tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ty dang ca hoi. hieu ve cam ((xuc va) OR (luc va)) dau lai ((cuu tre) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: vu bach ty dang ca hoi. hieu ve cam ((xuc va) or (luc va)) dau lai ((cuu tre) or (dau tren))*.