Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thu sach » tu sach, thuat sach, thuoc sach
va thanh » ban thanh, va tinh, le thanh
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
va tham » van tham, va cham, va thuat
di su » doi su, ki su, da su

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ma hoa. lieu va tham thuc ((va thanh) or (gia thanh)) di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ma hoa. lieu va tham thuc ((va thanh) OR (gia thanh)) di su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ma hoa. lieu va tham thuc ((va thanh) or (gia thanh)) di su triet*.