Perhaps you should try some spelling variations:
thieu nien » thien nhien
cac thoi » cac toi, cac hop, cac tro
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
vi cuu » vi luu, vinh cuu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang o hoi. ((thieu nien) or (dieu khien)) ((cac tuc) or (cac thoi)) va hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hoi. ((thieu nien) OR (dieu khien)) ((cac tuc) OR (cac thoi)) va hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoi. ((thieu nien) or (dieu khien)) ((cac tuc) or (cac thoi)) va hanh vi cuu tre*.