Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
toan ky » than ky, toan ly, toan ke
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va cham » va chat, va tham
truc va » thuc va, thuc vat, trung va
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
va cam » va cac, va cao, va cai
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat toan ky lang xa hoi. hieu ((va cam) or (va cham)) truc va hang di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat toan ky lang xa hoi. hieu ((va cam) OR (va cham)) truc va hang di cua viet.
• Adding a wildcard symbol may retrieve word variants: thuat toan ky lang xa hoi. hieu ((va cam) or (va cham)) truc va hang di cua viet*.