Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
nam thuc » nam thuoc, am thuc, nam thu
toc sach » hoc sach, doc sach, thuoc sach
thi hanh » thi thanh
ve triet » su triet
hanh lam » thanh lap, hanh kem, dinh lam
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
va hoi » xa hoi, va hoc, va hoa
ve nam » he nam, va nam, le nam

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) or (toc sach)) thi hanh va hoi. hieu ve nam thuc va hanh lam ((ve triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (toc sach)) thi hanh va hoi. hieu ve nam thuc va hanh lam ((ve triet) OR (va trien)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (toc sach)) thi hanh va hoi. hieu ve nam thuc va hanh lam ((ve triet) or (va trien))*.