Perhaps you should try some spelling variations:
thanh dan » thanh van, thanh dat, thanh tan
thanh dam » thanh dat, thanh nam, thanh tam
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
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: te sach ky nang ma hoa. hieu ve cac duc va ((((thanh dan) OR (thanh dam))) or (thanh san)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ma hoa. hieu ve cac duc va ((((thanh dan) OR (thanh dam))) OR (thanh san)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang ma hoa. hieu ve cac duc va ((((thanh dan) OR (thanh dam))) or (thanh san)) cua tre*".