Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
dang xay » dang van, van xay
vu sach » vu bach, vu khach
vai cua » dai cua, hai cua, lai cua
cam loc » cam lo
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
su sach » so sach
ve cam » ve cham, ve cac, va cam
loc va » hoc va, luc va
vi cua » di 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) OR (su sach)) ky dang xay hoi. hieu ve cam loc va thanh ((vi cua) or (vai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky dang xay hoi. hieu ve cam loc va thanh ((vi cua) OR (vai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) ky dang xay hoi. hieu ve cam loc va thanh ((vi cua) or (vai cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) ky dang xay hoi. hieu ve cam loc va thanh ((vi cua) or (vai cua)) te*.