Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cam truc » cau truc, nam truc, lam truoc
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
va cam » va cham, va cac, va cao
cua tu » cua tuc, cua su, cua cu

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

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