Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
thanh vai » thanh van, thanh tai, thanh oai
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
cuu va » cuu van, cuu ve
ve cap » ve cac, le cap, ve cai

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

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