Perhaps you should try some spelling variations:
luoc can » luc canh, hoc can, luoc dai
cua viet » ca viet, cua vat, cua dieu
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi ((cua viet) or (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang x hoi. hieu ve cac ((duc van) OR (luoc can)) hanh vi ((cua viet) OR (hoa viet)).
• Adding a wildcard symbol may retrieve word variants: te sac ky nang x hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi ((cua viet) or (hoa viet))*.