Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
ha hoi » hoa hoi, ha noi, xa hoi
tac ha » bac ha, tac da, tac xa
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, va cam

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 y) or (sach thu)) lang ha hoi. hieu ve cam ((tac ha) or (tuc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sach thu)) lang ha hoi. hieu ve cam ((tac ha) OR (tuc va)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach thu)) lang ha hoi. hieu ve cam ((tac ha) or (tuc va)) hanh vi cua tre*.