Perhaps you should try some spelling variations:
sang tay » sang tao, sang tai, sang tac
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
tay hoi » tay ho, tao hoi, tay thai
ky sang » ky nang, ky dang, ky tang
va dao » ca dao
va cua » va chua, via cua, ca 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 ky sang tay hoi. ((hieu ve) or (lieu va)) cac tuc ((va dau) OR (va dao)) va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang tay hoi. ((hieu ve) OR (lieu va)) cac tuc ((va dau) OR (va dao)) va cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang tay hoi. ((hieu ve) or (lieu va)) cac tuc ((va dau) OR (va dao)) va cua te*".