Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh tai » thanh tai, hang tai, han tai
dang xay » dang van, van xay
cua tre » cua te, cuu tre, dua tren
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
lang xa » lang ha, lang van
sai ky » sac ky
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((lang xa) or (dang xay)) hoi. hieu ve cac luc va hanh tai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((lang xa) OR (dang xay)) hoi. hieu ve cac luc va hanh tai ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((lang xa) or (dang xay)) hoi. hieu ve cac luc va hanh tai ((cua tre) or (cua triet))*.