Perhaps you should try some spelling variations:
lang dan » lang van, tang dan, lan dan
hanh vai » hanh vi, hanh tai, hanh van
dang dan » dang dang, dang van, dung dan
sach tay » xach tay, sach hay, sach nay
su sach » so sach, vu sach
cac duc » cac du, cao duc, cac dac
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
ve cac » va cac, vien cac

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 tay ((lang dan) OR (dang dan)) hoi. hieu ve cac duc va ((hanh vai) or (hanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tay ((lang dan) OR (dang dan)) hoi. hieu ve cac duc va ((hanh vai) OR (hanh va)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tay ((lang dan) OR (dang dan)) hoi. hieu ve cac duc va ((hanh vai) or (hanh va)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach tay ((lang dan) OR (dang dan)) hoi. hieu ve cac duc va ((hanh vai) or (hanh va)) cuu tre*.