Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
tan hanh » tan thanh, tang hanh, toan hanh
cau tren » cu tren, dau tren, ca tren
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky ((nang xa) or (lang xa)) hoi. hieu ve cham duc tan hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky ((nang xa) OR (lang xa)) hoi. hieu ve cham duc tan hanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: bo sach ky ((nang xa) or (lang xa)) hoi. hieu ve cham duc tan hanh vi ((cua tre) or (cau tren))*.