Perhaps you should try some spelling variations:
danh vai » danh sai, danh va, doanh van
vai cua » dai cua, hai cua, lai cua
sach ty » sach y, sach thu, xach tay
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
sach tu » sach thu, cach tu, sach uu
loc va » hoc va
luc va » duc va, tuc va
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ty) OR (sach tu)) nang x hoi. hieu ve cac ((loc va) or (luc va)) danh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ty) OR (sach tu)) nang x hoi. hieu ve cac ((loc va) OR (luc va)) danh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ty) OR (sach tu)) nang x hoi. hieu ve cac ((loc va) or (luc va)) danh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ty) OR (sach tu)) nang x hoi. hieu ve cac ((loc va) or (luc va)) danh vai cua tre*.