Perhaps you should try some spelling variations:
dang xay » dang van, van xay
tan lanh » tai lanh, thanh lanh, tan thanh
lanh hai » manh hai, thanh hai, lang chai
cua viet » hoa viet, cua vat, cua dieu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
ca viet » va viet, co viet, hoa viet
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 ky dang xay hoi. hieu ve cac duc tan lanh hai ((cua viet) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xay hoi. hieu ve cac duc tan lanh hai ((cua viet) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xay hoi. hieu ve cac duc tan lanh hai ((cua viet) or (ca viet))*.