Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
vu sach » vu bach, su sach, vu khach
cac loc » cac lop, cac toc, cac hoc
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh, ky dang
ty danh » ty doanh, ty anh, te danh
ve cac » va cac, vien cac
loc va » hoc va, luc va
di cua » doi cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((ty danh) or (ky danh)) xay hoi. hieu ve cac loc va thanh ((di cua) OR (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ty danh) OR (ky danh)) xay hoi. hieu ve cac loc va thanh ((di cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ty danh) or (ky danh)) xay hoi. hieu ve cac loc va thanh ((di cua) OR (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ty danh) or (ky danh)) xay hoi. hieu ve cac loc va thanh ((di cua) OR (dai cua)) te*.