Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
cau tren » cu tren, dau tren, cau treo
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
te sach » toc sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ca tren » cu tren, la tren, co tren
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: te sach y nang o hoi. hieu ve cham duc van hanh vi ((cua tre) or (((cau tren) OR (ca tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang o hoi. hieu ve cham duc van hanh vi ((cua tre) OR (((cau tren) OR (ca tren))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang o hoi. hieu ve cham duc van hanh vi ((cua tre) or (((cau tren) OR (ca tren))))*".