Perhaps you should try some spelling variations:
dang xay » dang van, van xay
su sach » so sach, vu sach
cuc ban » cac ban, cuu ban, duc ban
hoi cua » hoi chuc
hai cua » thai cua, dai cua, lai cua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky dang xay hoi. hieu ve cam ((cuc ban) OR (cua ban)) lanh ((hai cua) or (hoi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu ve cam ((cuc ban) OR (cua ban)) lanh ((hai cua) OR (hoi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xay hoi. hieu ve cam ((cuc ban) OR (cua ban)) lanh ((hai cua) or (hoi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu ve cam ((cuc ban) OR (cua ban)) lanh ((hai cua) or (hoi cua)) tre*.