Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
ca viet » va viet, co viet, hoa viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang xa) or (lang xa)) hoi. hieu van tham thuc va thanh vi ((su triet) or (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (lang xa)) hoi. hieu van tham thuc va thanh vi ((su triet) OR (ca viet)).
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) or (lang xa)) hoi. hieu van tham thuc va thanh vi ((su triet) or (ca viet))*.