Perhaps you should try some spelling variations:
lang chai » lang ha, lang cua, lang phi
cua viet » ca viet, hoa viet, cua vat
danh xay » dang xay, manh xay, anh xay
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
su sach » so sach
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh, ky dang
vu sach » vu bach, vu khach
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac

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) OR (vu sach)) ky danh xay hoi. hieu ve cac duc ban ((lanh dao) or (lang chai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ky danh xay hoi. hieu ve cac duc ban ((lanh dao) OR (lang chai)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ky danh xay hoi. hieu ve cac duc ban ((lanh dao) or (lang chai)) cua viet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ky danh xay hoi. hieu ve cac duc ban ((lanh dao) or (lang chai)) cua viet*.