Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
dua tren » dung tren
van anh » van thanh, tuan anh, van minh
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cao luc » bao luc, cao duc, cao suc
luc van » luoc van, luu van, duc van
va cao » va cac, va co, va dao
anh vi » hanh vi, anh va, anh ve
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu

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 (lang xa)) hoi. hieu va cao luc van anh vi ((dua tren) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky ((nang xa) OR (lang xa)) hoi. hieu va cao luc van anh vi ((dua tren) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: thuat sac ky ((nang xa) or (lang xa)) hoi. hieu va cao luc van anh vi ((dua tren) or (cua tu))*.