Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
hoc can » hoc dan, hoc cao, hoc cac
ky sang » ky nang, ky tang, duy sang
vai cua » dai cua, hai cua, lai cua
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
te sac » te sach, te cac, te san
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 sang) OR (ky dang)) ma hoi. hieu ve cac ((duc van) or (hoc can)) hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ((ky sang) OR (ky dang)) ma hoi. hieu ve cac ((duc van) OR (hoc can)) hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ((ky sang) OR (ky dang)) ma hoi. hieu ve cac ((duc van) or (hoc can)) hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: te sac ((ky sang) OR (ky dang)) ma hoi. hieu ve cac ((duc van) or (hoc can)) hanh vai cua te*.