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