Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
bang vat » bang va, dang vat, cang vat
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
vat hoi » vat hoc, va hoi, van hoi
ky bang » ky nang, ky dang, ke bang
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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 ky bang vat hoi. hieu van cam duc va hanh vi ((cua te) or (((cau tren) or (cua tre))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky bang vat hoi. hieu van cam duc va hanh vi ((cua te) OR (((cau tren) OR (cua tre)))).
• Adding a wildcard symbol may retrieve word variants: te sach ky bang vat hoi. hieu van cam duc va hanh vi ((cua te) or (((cau tren) or (cua tre))))*.