Perhaps you should try some spelling variations:
thieu nien » thien nhien
nien bach » vien bach, dien sach, mien bac
su triet » su viet, su tien, ve triet
dinh vai » dinh van, dinh vi, dinh va
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
bach lo » sach lo, bach hoa, bach mao
nang o » nang co, nang ho, nang ro
lo va » lo van, lao va, ly va
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 ty nang o hoi. thieu nien bach lo va dinh vai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hoi. thieu nien bach lo va dinh vai ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoi. thieu nien bach lo va dinh vai ((cua tre) or (su triet))*.