Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
thuc day » thuc vat
lang van » dang van, tang van, hoang van
bach ky » bac ky
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay
vi cuu » vi luu, vinh cuu
va nam » van nam, ha nam, va nay

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

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