Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
cua viet » ca viet, hoa viet, cua vat
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
qua cam » qua cham, qua cac, qua ca
xuc va » luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 dang xa hoi. hieu qua cam ((((xuc va) or (tuc va))) or (duc va)) hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky dang xa hoi. hieu qua cam ((((xuc va) OR (tuc va))) OR (duc va)) hanh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: so sach ky dang xa hoi. hieu qua cam ((((xuc va) or (tuc va))) or (duc va)) hanh dai cua viet*.