Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
va dinh » van dinh, va kinh, va tinh
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
de cua » le cua, te cua, dieu cua
va dan » ca dan, va dao, va dau
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty nang xa hoi. hieu ve ((cap nuoc) or (dat nuoc)) ((va dan) or (va dinh)) de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty nang xa hoi. hieu ve ((cap nuoc) OR (dat nuoc)) ((va dan) OR (va dinh)) de cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu ve ((cap nuoc) or (dat nuoc)) ((va dan) or (va dinh)) de cua te*.