Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
lang xa » lang ha, dang xay, lang van
cao duc » cao suc, giao duc, tao duoc
dao duc » giao duc, tao duoc
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
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: te ((sac ky) or (sach y)) lang xa hoi. lieu va ((cao duc) OR (dao duc)) va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach y)) lang xa hoi. lieu va ((cao duc) OR (dao duc)) va hanh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sach y)) lang xa hoi. lieu va ((cao duc) OR (dao duc)) va hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sach y)) lang xa hoi. lieu va ((cao duc) OR (dao duc)) va hanh tai cua tre*.