Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, lang van
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky ((lang xa) OR (dang xay)) hoi. hieu va cam luc va hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((lang xa) OR (dang xay)) hoi. hieu va cam luc va hanh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((lang xa) OR (dang xay)) hoi. hieu va cam luc va hanh tai cua tre*.