Perhaps you should try some spelling variations:
nam truoc » nam thuoc, lam truoc, nam truc
thuat sac » thuat sach, thuat san, thuat tac
truoc va » truc va, thuoc va, truong va
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay
vi hoa » voi hoa, bi hoa, vi ha
vi hoc » li hoc, va hoc
va hoa » van hoa, va hoc, ma hoa

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 hoi. hieu va nam truoc va hanh ((((vi hoa) or (vi hoc))) or (va hoa)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sac ky nang xa hoi. hieu va nam truoc va hanh ((((vi hoa) OR (vi hoc))) OR (va hoa)) viet.
• Adding a wildcard symbol may retrieve word variants: thuat sac ky nang xa hoi. hieu va nam truoc va hanh ((((vi hoa) or (vi hoc))) or (va hoa)) viet*.