Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ve triet » va trien, su triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang

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

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