Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
su triet » su viet, ve triet
thi hanh » thi thanh
hanh vai » hanh vi, hanh va, hanh tai
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, te sach, tu cach
hieu le » hieu ve, hieu he, hieu ly
hanh xa » hanh va, hanh ma, hanh xu
su sach » so sach, vu sach
su tien » su kien, su hien, tu tieng
le nam » ly nam, he nam, le na

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 (su sach)) thi hanh xa hoi. hieu le nam thuc vat hanh vai ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) thi hanh xa hoi. hieu le nam thuc vat hanh vai ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) thi hanh xa hoi. hieu le nam thuc vat hanh vai ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) thi hanh xa hoi. hieu le nam thuc vat hanh vai ((su triet) OR (su tien))*.