Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dung tren » dung trong, dung trung
nam thuc » nam thuoc, am thuc, nam thu
day hanh » day nhanh, day thanh, dao hanh
lang van » dang van, tang van, hoang van
thuc day » thuc dan, thuc vat
bach ky » bac ky
lang xa » lang ha, dang xay
hieu va » lieu va, hieu qua
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 hanh vi ((dung tren) or (cua triet))~.
• 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 hanh vi ((dung tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: vu bach ky ((lang xa) or (lang van)) hoi. hieu va nam thuc day hanh vi ((dung tren) or (cua triet))*.