Perhaps you should try some spelling variations:
lanh dai » lanh dao, lanh hai, lang dai
ban lanh » ban hanh, ban linh, ban anh
cham duc » pham duc, pham duy, phan duc
hieu va » lieu va, hieu qua
sach ky » sach y, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky

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) or (sac ky)) lang xa hoi. hieu va ((cham duc) OR (cham soc)) ban lanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) lang xa hoi. hieu va ((cham duc) OR (cham soc)) ban lanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) lang xa hoi. hieu va ((cham duc) OR (cham soc)) ban lanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) lang xa hoi. hieu va ((cham duc) OR (cham soc)) ban lanh dai cua tre*.