Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh ha » thanh hoa, thanh hai, nhanh ha
thanh va » thanh van, hanh va, thanh ve
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
sach tu » sach thu, cach tu, sach ty

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 ky) or (sach tu)) dang xay hoi. hieu van nam thuc va ((thanh va) OR (thanh ha)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach tu)) dang xay hoi. hieu van nam thuc va ((thanh va) OR (thanh ha)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach tu)) dang xay hoi. hieu van nam thuc va ((thanh va) OR (thanh ha)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach tu)) dang xay hoi. hieu van nam thuc va ((thanh va) OR (thanh ha)) su triet*.