Perhaps you should try some spelling variations:
thieu nien » thien nhien
cach tru » cach tu, cac tru, cach thuc
tru nang » tra nang, tri nang, truc nano
mai khoi » mai khoa, tai khoa, cac khoi
nien cac » vien cac, dien cac, bien cac
tu cach » tu cac
lai hoi » dai hoi, lai roi, mai hoi
lai hoa » dai hoa, loai hoc
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
vi hoa » voi hoa, vi hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach tru nang ((mai khoi) or (((lai hoi) or (lai hoa)))). thieu nien cac duc va hanh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tru nang ((mai khoi) OR (((lai hoi) OR (lai hoa)))). thieu nien cac duc va hanh vi hoa viet.
• Adding a wildcard symbol may retrieve word variants: tu cach tru nang ((mai khoi) or (((lai hoi) or (lai hoa)))). thieu nien cac duc va hanh vi hoa viet*.