Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
cau tren » cu tren, dau tren, cau treo
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
sach ly » sach y, sach lo, sach ty
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
ly nang » ky nang, ly hang, ly vang
ca tren » cu tren, la tren, co tren
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 vu cham duc va 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 ly nang o hoi. hieu vu cham duc va 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 ly nang o hoi. hieu vu cham duc va hanh vi ((cua tre) or (((cau tren) OR (ca 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 (((cau tren) OR (ca tren))))*.