Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
cua viet » ca viet, hoa viet, cua vat
danh xay » dang xay, manh xay, anh xay
lanh hoi » lanh hai, lanh voi, hanh thoi
tan lanh » tai lanh, thanh lanh, tan thanh
dac tan » duc tan, dac san, dai tan
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky danh » ky anh, ky dang
cac dac » cac dan, cac dai, cac bac
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: so sach ky danh xay hoi. hieu ve cac dac tan lanh hoi ((cua viet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky danh xay hoi. hieu ve cac dac tan lanh hoi ((cua viet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: so sach ky danh xay hoi. hieu ve cac dac tan lanh hoi ((cua viet) or (va trien))*.