Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
tu sach » thu sach, su sach, te sach
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
hanh x » hanh xu, hanh y, anh x
anh va » hanh va

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 thi ((hanh x) OR (hanh _)) ho. hieu ve cac xuc van ((anh viet) or (anh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi ((hanh x) OR (hanh _)) ho. hieu ve cac xuc van ((anh viet) OR (anh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi ((hanh x) OR (hanh _)) ho. hieu ve cac xuc van ((anh viet) or (anh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thi ((hanh x) OR (hanh _)) ho. hieu ve cac xuc van ((anh viet) or (anh va)) cua tre*.