Perhaps you should try some spelling variations:
dau thuc » dan thuc, dai thuc, dam thuc
cua viet » ca viet, cua vat, cua dieu
hanh lai » hanh lam, hanh tai, thanh lap
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
van dau » van dao, phan dau
nang xa » nang x, lang xa, nang ma
sach ty » sach tu, sach thu, xach tay

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 y) or (sach ty)) nang xa hoi. hieu van dau thuc va hanh lai ((cua viet) OR (hoa viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sach ty)) nang xa hoi. hieu van dau thuc va hanh lai ((cua viet) OR (hoa viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach y) or (sach ty)) nang xa hoi. hieu van dau thuc va hanh lai ((cua viet) OR (hoa viet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach ty)) nang xa hoi. hieu van dau thuc va hanh lai ((cua viet) OR (hoa viet))*.