Perhaps you should try some spelling variations:
thuat thuc » thuat thuy, thuyet thuc, thuc thuc
van thuat » va thuat, van thuan, van tuan
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
sach ky » sach y, sach ty, sach kem
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
sac ky » cac ky, sai ky
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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) or (sac ky)) nang x hoi. hieu van thuat thuc va danh di ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang x hoi. hieu van thuat thuc va danh di ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) nang x hoi. hieu van thuat thuc va danh di ((dua tren) or (cua te))*.