Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
sach thu » sach thue, sach thieu, sach tham
va thanh » gia thanh, ban thanh, va tinh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sach tu » cach tu, sach ty, sach uu
hieu ve » hieu va
lang xa » lang ha, dang xay, lang van
cuu va » cuu van, cuu ve

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

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