Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cham duc » pham duc, cham soc, pham duy
thanh ha » thanh hoa, thanh hai, nhanh ha
thanh vi » hanh vi, thanh va, thanh ve
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
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. hieu ve cham duc va ((thanh vi) or (thanh ha)) ((cua tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hoi. hieu ve cham duc va ((thanh vi) OR (thanh ha)) ((cua tre) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoi. hieu ve cham duc va ((thanh vi) or (thanh ha)) ((cua tre) or (dau tren))*.