Perhaps you should try some spelling variations:
thuat cac » thuat cam, thuat cao, thuat cat
dua tren » dung tren
van hanh » van thanh, ban hanh, van anh
luoc van » luoc can, luoc va, luc van
cam luoc » cam xuc, tom luoc, cam lo
hieu va » lieu va, hieu qua
lang xa » dang xay, lang van
lang ha » long ha
va cam » va cham, va cac, va cao
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 cac ky ((lang xa) or (lang ha)) hoi. hieu va cam luoc van hanh vi ((dua tren) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat cac ky ((lang xa) OR (lang ha)) hoi. hieu va cam luoc van hanh vi ((dua tren) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: thuat cac ky ((lang xa) or (lang ha)) hoi. hieu va cam luoc van hanh vi ((dua tren) or (cua tu))*.