Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thuc giai » thuoc giao, hoc giai, thuc thai
cua triet » cua viet, su triet, va triet
thang va » trang va, thong va, thanh va
nang xa » lang xa, nang ma, mang xa
va tham » van tham, va cham, va thanh
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang xa) OR (nang x)) hoi. lieu va tham thuc giai ((thang va) or (hang va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (nang x)) hoi. lieu va tham thuc giai ((thang va) OR (hang va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang xa) OR (nang x)) hoi. lieu va tham thuc giai ((thang va) or (hang va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) OR (nang x)) hoi. lieu va tham thuc giai ((thang va) or (hang va)) cua triet*.