Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh de » hanh ve, hanh kem
hoa hoi » khoa hoi, hoa hoc, hoa doi
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
cau duc » cao duc, cau luc, chu duc
duc van » duc va, duc tan, duc manh
te cac » tu cac, ve cac, te cao
ve cau » ke cau, va cau, ve cac

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

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