Perhaps you should try some spelling variations:
nam thuc » nam thuoc, nam thu, nam tu
hanh vai » hanh vi, hanh va, hanh tai
day hanh » day nhanh, day thanh, dao hanh
lang van » dang van, tang van, hoang van
bach ky » bac ky
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet

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) or (am thuc)) day hanh vai cua 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) OR (am thuc)) day hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: vu bach ky ((lang xa) or (lang van)) hoi. hieu va ((nam thuc) or (am thuc)) day hanh vai cua tre*.