Perhaps you should try some spelling variations:
dan hanh » dang hanh, dan khanh, dan thanh
tu sach » thu sach, su sach, te sach
cac tac » cac toc, cac bac, cac dac
lai cua » dai cua, hai cua, lai chau
da hanh » dao hanh, da thanh, dna hanh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa
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 sach ky ((nang xa) OR (nang x)) hoi. hieu ve cac tac ((da hanh) or (dan hanh)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. hieu ve cac tac ((da hanh) OR (dan hanh)) lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (nang x)) hoi. hieu ve cac tac ((da hanh) or (dan hanh)) lai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) OR (nang x)) hoi. hieu ve cac tac ((da hanh) or (dan hanh)) lai cua tre*.