Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
dang xay » dang van, van xay
tham luc » than luc, tham nuoc, tham thuc
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
dang xa » lang xa, dang ha, dang va
sac ky » cac ky, sai ky
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 ((dang xa) OR (dang xay)) hoi. hieu va tham luc va hanh tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky ((dang xa) OR (dang xay)) hoi. hieu va tham luc va hanh tai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky ((dang xa) OR (dang xay)) hoi. hieu va tham luc va hanh tai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sac ky ((dang xa) OR (dang xay)) hoi. hieu va tham luc va hanh tai ((cua tre) or (cuu tre))*.