Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien cac » vien cac, dien cac, bien cac
hanh vii » hanh voi, hanh va, hanh noi
cua viet » ca viet, hoa viet, cua vat
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
cac luu » cac luat, sach luu
luu van » cuu van, luan van, luu hanh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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 tang xa hoi. thieu nien cac luu van ((hanh vii) or (hanh vi)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky tang xa hoi. thieu nien cac luu van ((hanh vii) OR (hanh vi)) cua viet.
• Adding a wildcard symbol may retrieve word variants: te sac ky tang xa hoi. thieu nien cac luu van ((hanh vii) or (hanh vi)) cua viet*.