Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
minh chi » linh chi, minh chau, minh thu
dinh chi » dinh thi, dinh tri, dinh moi
sang ma » tang ma, nang ma, sang tao
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
tu sai » tu bai, tu san, tu cai
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((nang cao) or (sang ma)) hoi. hieu van nam thuc va tinh ((minh chi) OR (dinh chi)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((nang cao) OR (sang ma)) hoi. hieu van nam thuc va tinh ((minh chi) OR (dinh chi)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((nang cao) or (sang ma)) hoi. hieu van nam thuc va tinh ((minh chi) OR (dinh chi)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((nang cao) or (sang ma)) hoi. hieu van nam thuc va tinh ((minh chi) OR (dinh chi)) tre*.