Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
va dinh » van dinh, va kinh, va tinh
dinh du » dinh duc, dinh cu, dinh tu
x hoi » xa hoi, o hoi, x ho
du va » dau va, tu va, su va
thiet » thieu

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 x hoi. hieu ve ((cham soc) or (pham duc)) va dinh du va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve ((cham soc) OR (pham duc)) va dinh du va thiet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve ((cham soc) or (pham duc)) va dinh du va thiet*.