Perhaps you should try some spelling variations:
ban tinh » ban thanh, quan tinh, ban hanh
tu sach » thu sach, te sach, tu cach
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
cau duc » cao duc, cau luc, chu duc
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
ve cau » ke cau, ve cac, le cau
va chu » va che, va chi
va cau » van cau, va cac, va dau

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)) ky nang xa hoi. hieu ve cau duc ban tinh ((va chu) or (va cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu ve cau duc ban tinh ((va chu) OR (va cau)) tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang xa hoi. hieu ve cau duc ban tinh ((va chu) or (va cau)) tre*.