Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
va triet » va trien, ve triet, cua triet
su sach » so sach, vu sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va nam » van nam, ha nam, va nay
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang xa hoi. hieu va nam thuc ((va hanh) or (va danh)) vai ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu va nam thuc ((va hanh) OR (va danh)) vai ((va triet) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu va nam thuc ((va hanh) or (va danh)) vai ((va triet) or (va thiet))*.