Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
toan ky » toan ly, toan ke, toan may
lang xa » lang ha, dang xay, lang van
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
va cam » va cham, 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) OR (than ky)) lang xa hoi. hieu ((va cam) or (va cac)) truc va hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((toan ky) OR (than ky)) lang xa hoi. hieu ((va cam) OR (va cac)) truc va hanh di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((toan ky) OR (than ky)) lang xa hoi. hieu ((va cam) or (va cac)) truc va hanh di cua viet".
• Adding a wildcard symbol may retrieve word variants: thuat ((toan ky) OR (than ky)) lang xa hoi. hieu ((va cam) or (va cac)) truc va hanh di cua viet*.