Perhaps you should try some spelling variations:
tu sach » thu sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
vi cua » vai cua, di 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: ((tu sach) or (su sach)) ty nang xa hoi. hieu ((va cam) OR (va cao)) duc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang xa hoi. hieu ((va cam) OR (va cao)) duc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ty nang xa hoi. hieu ((va cam) OR (va cao)) duc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ty nang xa hoi. hieu ((va cam) OR (va cao)) duc va hanh vi cua te*.