Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach ly » sach y, sach lo, sach ty
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
va chat » van chat, va phat, cao chat
te sach » toc sach
ve chat » van chat
ly nang » ky nang, ly hang, ly vang
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: te sach ly nang o hoi. hieu ((ve chat) OR (va chat)) duc va hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang o hoi. hieu ((ve chat) OR (va chat)) duc va hanh vi ((cua tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ly nang o hoi. hieu ((ve chat) OR (va chat)) duc va hanh vi ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang o hoi. hieu ((ve chat) OR (va chat)) duc va hanh vi ((cua tre) or (cau tren))*.