Perhaps you should try some spelling variations:
thanh loi » thanh hoa, thanh hai, thanh lap
tu sach » thu sach, su sach, te sach
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
sach v » sach va, sach y, sach 2
ve cam » ve cham, ve cac, ve cai
v nang » va nang, vu nang, van nang
va cam » va cham, va cac, va cao

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

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