Perhaps you should try some spelling variations:
thuat tac » thuat tach, thuat tao, thuat tai
dua tren » dung tren
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, nang ma
cua te » cua tu
luc va » duc va, tuc va, loc va
tac ky » tac ke, cac ky, tap ky
va cao » va cac, va dao, va bao
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat tac ky nang xa hoi. hieu ((va cao) OR (va co)) luc va hanh vai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat tac ky nang xa hoi. hieu ((va cao) OR (va co)) luc va hanh vai ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat tac ky nang xa hoi. hieu ((va cao) OR (va co)) luc va hanh vai ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thuat tac ky nang xa hoi. hieu ((va cao) OR (va co)) luc va hanh vai ((dua tren) or (cua te))*.