Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
dang ma » dang mau, dang mam, dang mat
sach vu » sach tu, sach uu, sach xu
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
sach va » sach xa, sach ha, sach dao
hanh ki » hanh vi, hanh ky, hanh kien
ma hoi » mai hoi, xa hoi, ma hoa
ki su » ky su

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 vu) OR (sach va)) dang ma hoi. hieu va tham thuc van hanh ki su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach vu) OR (sach va)) dang ma hoi. hieu va tham thuc van hanh ki su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach vu) OR (sach va)) dang ma hoi. hieu va tham thuc van hanh ki su triet*.