Perhaps you should try some spelling variations:
thuat sac » thuat sach, thuat san, thuat tac
dua tren » dung tren
van hanh » van thanh, ban hanh, van anh
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
hieu va » lieu va, hieu qua
lang ha » long ha
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
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 (lang ha)) hoi. hieu va cam luc van hanh 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 (lang ha)) hoi. hieu va cam luc van hanh vi ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: thuat sac ky ((nang xa) or (lang ha)) hoi. hieu va cam luc van hanh vi ((dua tren) or (cua te))*.