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
va danh » va dan, va hanh, dia danh
di cua » dai cua, doi cua, de cua
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 danh) or (va dinh)) di 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 danh) OR (va dinh)) di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty nang xa hoi. hieu ve ((cap nuoc) OR (dat nuoc)) ((va danh) or (va dinh)) di cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ty nang xa hoi. hieu ve ((cap nuoc) OR (dat nuoc)) ((va danh) or (va dinh)) di cua te*.