Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
dua tren » dung tren
hanh anh » thanh anh, hinh anh, anh anh
luu hanh » huu han
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
va cao » va cac, va co, va dao
anh vi » hanh vi, anh va, anh ve
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sac ky ((nang xa) or (dang xay)) hoi. hieu va cao luu hanh anh vi ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky ((nang xa) OR (dang xay)) hoi. hieu va cao luu hanh anh vi ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thuat sac ky ((nang xa) or (dang xay)) hoi. hieu va cao luu hanh anh vi ((dua tren) or (cua te))*.