Perhaps you should try some spelling variations:
te sach » toc sach
hai cua » thai cua, hoi cua, lai cua
ban anh » ban hanh, ban banh, ban danh
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tay hoi » tay ho, tao hoi, tay thai
xay hoi » xa hoi, cay phoi, gay thoi
ve cac » va cac, vien cac
ky anh » ky danh, ly anh, ty anh

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky anh ((xay hoi) or (tay hoi)). hieu ve cac duc ban anh ((hai cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky anh ((xay hoi) OR (tay hoi)). hieu ve cac duc ban anh ((hai cua) OR (dai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky anh ((xay hoi) or (tay hoi)). hieu ve cac duc ban anh ((hai cua) OR (dai cua)) tre*".