Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
cuu tre » cua tre, cau tren, cau treo
soc van » hoc van, oc van, sac van
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
te sach » toc sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua

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 ty ((lang xa) or (nang x)) hoi. hieu va cham soc van hanh vi ((cuu tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((lang xa) OR (nang x)) hoi. hieu va cham soc van hanh vi ((cuu tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: te sach ty ((lang xa) or (nang x)) hoi. hieu va cham soc van hanh vi ((cuu tre) or (va triet))*.