Perhaps you should try some spelling variations:
va thanh » ban thanh, va tinh, le thanh
vu sach » vu bach, su sach, vu khach
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh
ky dang » ky nang
vi cua » vai cua, di 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: vu sach ((ky dang) OR (ky danh)) xay hoi. hieu va cac tuc ((va thanh) or (gia thanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ky dang) OR (ky danh)) xay hoi. hieu va cac tuc ((va thanh) OR (gia thanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ky dang) OR (ky danh)) xay hoi. hieu va cac tuc ((va thanh) or (gia thanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky dang) OR (ky danh)) xay hoi. hieu va cac tuc ((va thanh) or (gia thanh)) vi cua te*.