Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
qua nam » quan nam, cua nam, quang nam
thuc va » thuc vat, thuc day
luu tre » luu tru, cuu tre, luy tre
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang xa) or (lang xa)) hoi. hieu qua nam ((thuc va) OR (thuc dan)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang xa) OR (lang xa)) hoi. hieu qua nam ((thuc va) OR (thuc dan)) hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((nang xa) or (lang xa)) hoi. hieu qua nam ((thuc va) OR (thuc dan)) hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang xa) or (lang xa)) hoi. hieu qua nam ((thuc va) OR (thuc dan)) hanh vi luu tre*.