Perhaps you should try some spelling variations:
thuat sai » thuat bai, thuat san, thuat cai
ban hanh » ban hang
dua tren » dung tren
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
hanh va » hang va, hanh vi
sai ky » sac ky
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 sai ky ((nang xa) or (lang xa)) hoi. lieu va cam duc ban hanh va ((dua tren) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sai ky ((nang xa) OR (lang xa)) hoi. lieu va cam duc ban hanh va ((dua tren) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: thuat sai ky ((nang xa) or (lang xa)) hoi. lieu va cam duc ban hanh va ((dua tren) or (cua tu))*.