Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
va triet » va thiet, va trien, ve triet
tham tuc » thai tuc, nham thuc, pham thuc
hieu van » hieu va, thien van, lieu va
tu nano » truc nano
tu nang » tru nang, tu nong, tu lang
va dinh » van dinh, va kinh, va tinh
dinh su » dinh so, hinh su, dinh cu
tu sach » thu sach, su sach, te sach
x hoi » xa hoi, o hoi, x ho
su va » su van, tu va

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 ((tu nang) or (tu nano)) x hoi. hieu van ((tham tuc) OR (tham thuc)) va dinh su va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu nang) OR (tu nano)) x hoi. hieu van ((tham tuc) OR (tham thuc)) va dinh su va triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu nang) or (tu nano)) x hoi. hieu van ((tham tuc) OR (tham thuc)) va dinh su va triet*".