Perhaps you should try some spelling variations:
dang xay » dang van, van xay
vu sach » vu bach, vu khach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
cac luc » coc luc, cac nuoc, cac cuoc
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
su sach » so sach
va cua » va chua, via cua, ca 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 ((cac luc) OR (cau luc)) va hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky dang xay hoi. hieu ve ((cac luc) OR (cau luc)) va hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (su sach)) ky dang xay hoi. hieu ve ((cac luc) OR (cau luc)) va hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky dang xay hoi. hieu ve ((cac luc) OR (cau luc)) va hanh va cua tre*.