Perhaps you should try some spelling variations:
dang xay » dang van, van xay
hanh lai » hanh lam, hanh tai, thanh lap
cua tre » cua te, cuu tre, cua triet
thu day » thuc day, thu dac, thu dai
lang xa » lang ha, lang van
lai cua » dai cua, hai cua, lai chau
hieu va » lieu va, hieu qua
thu da » thu dac, thu dai, thu dau
su xac » pu xac, su cac
xac ky » cac ky, sac ky, bac ky
va ca » va cac, va cao, va cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ky ((lang xa) or (dang xay)) hoi. hieu va ca ((thu day) OR (thu da)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ky ((lang xa) OR (dang xay)) hoi. hieu va ca ((thu day) OR (thu da)) hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su xac ky ((lang xa) or (dang xay)) hoi. hieu va ca ((thu day) OR (thu da)) hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: su xac ky ((lang xa) or (dang xay)) hoi. hieu va ca ((thu day) OR (thu da)) hanh lai cua tre*.