Perhaps you should try some spelling variations:
tinh hai » tinh thai, tinh chat, trinh han
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
va tinh » may tinh
cao duc » dao duc, cao suc, giao duc
cam duc » cam xuc, pham duc, nam duoc
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet

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 ty ((tang ma) or (lang xa)) hoi. hieu qua ((cam duc) OR (cao duc)) va tinh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((tang ma) OR (lang xa)) hoi. hieu qua ((cam duc) OR (cao duc)) va tinh hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((tang ma) or (lang xa)) hoi. hieu qua ((cam duc) OR (cao duc)) va tinh hai cua tre*".