Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
duc van » duc va, duc tan, duc manh
cau duc » cao duc, cau luc, chu duc
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, ve cac
ha hoi » hoa hoi, ha noi, va hoi
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang ((ha hoi) or (xa hoi)). hieu ve cau duc van ((hanh kem) or (hanh vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ((ha hoi) OR (xa hoi)). hieu ve cau duc van ((hanh kem) OR (hanh vi)) cua viet.
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ((ha hoi) or (xa hoi)). hieu ve cau duc van ((hanh kem) or (hanh vi)) cua viet*.