Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, ve cai
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
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 cam) or (va cam)) duc va thanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hoi. hieu ((ve cam) OR (va cam)) duc va thanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hoi. hieu ((ve cam) or (va cam)) duc va thanh vi ((cua tre) or (cau tren))*.