Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh dai » hanh tai, hanh dao, vanh dai
van chau » van chat, van cau, van hau
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tu ban » thu ban, te ban
doc va » duoc va, duc va, loc va
tu can » tu cac, thu canh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu can) or (tu ban)) ky lang xa hoi. hieu van chau ((doc va) OR (hoc va)) hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu can) OR (tu ban)) ky lang xa hoi. hieu van chau ((doc va) OR (hoc va)) hanh dai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu can) or (tu ban)) ky lang xa hoi. hieu van chau ((doc va) OR (hoc va)) hanh dai cua viet".
• Adding a wildcard symbol may retrieve word variants: ((tu can) or (tu ban)) ky lang xa hoi. hieu van chau ((doc va) OR (hoc va)) hanh dai cua viet*.