Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban tinh » ban thanh, quan tinh, ban hanh
tu cach » tu cac
tinh vi » trinh vi, tinh voi, tinh va
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
ca cua » co cua
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (toc sach)) ky nang xa hoi. ((hieu ve) or (hieu va)) ca cua ban tinh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (toc sach)) ky nang xa hoi. ((hieu ve) OR (hieu va)) ca cua ban tinh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (toc sach)) ky nang xa hoi. ((hieu ve) or (hieu va)) ca cua ban tinh vi cuu tre*.