Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh ve » thanh va, thanh vien, thanh van
tu cach » tu cac
hanh ve » hanh vi, hanh va, hanh kem
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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: ((tu cach) or (thuoc sach)) ky lang xa hoi. hieu ve cac duc va ((thanh ve) OR (hanh ve)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thuoc sach)) ky lang xa hoi. hieu ve cac duc va ((thanh ve) OR (hanh ve)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thuoc sach)) ky lang xa hoi. hieu ve cac duc va ((thanh ve) OR (hanh ve)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thuoc sach)) ky lang xa hoi. hieu ve cac duc va ((thanh ve) OR (hanh ve)) cua tre*.