Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
cuu tre » cua tre, cau tren, cau treo
va hanh » van hanh, va thanh, va danh
ve cham » va cham, ve chat, vu cham
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
soc va » hoc va, loc va, doc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) or (nang ma)) hoi. hieu ve cham soc va hanh vi ((cuu tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. hieu ve cham soc va hanh vi ((cuu tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang ma)) hoi. hieu ve cham soc va hanh vi ((cuu tre) or (va triet))*.