Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
chat duc » chat xuc, chat doc, chet duoc
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
sach ly » sach y, sach lo, sach ty
te sach » toc sach
ly nang » ky nang, ly hang, ly vang
hieu ve » hieu va, hieu van
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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) OR (o hai)). hieu ve 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) OR (o hai)). hieu ve 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) OR (o hai)). hieu ve chat duc va hanh vi ((cua tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((o hoi) OR (o hai)). hieu ve chat duc va hanh vi ((cua tre) or (cau tren))*.