Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thu sach » thuat sach, thuoc sach, thu hoach
thi hanh » thi thanh
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
tu sach » su sach, te sach, tu cach
ve tham » va tham, ve cham, vi tham
hanh ma » hanh mau, hanh may, hanh va
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa

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