Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
va cam » va cham, va cac, va cao
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 ty hang xa hoi. hieu va cam ((xuc va) or (tuc va)) ((dung tai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang xa hoi. hieu va cam ((xuc va) OR (tuc va)) ((dung tai) OR (hanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang xa hoi. hieu va cam ((xuc va) or (tuc va)) ((dung tai) or (hanh va)) cua tre*.