Perhaps you should try some spelling variations:
nam truoc » nam thuoc, lam truoc, nam truc
thuat tac » thuat tach, thuat tao, thuat tai
truoc va » truc va, thuoc va, truong va
hoc viet » hoc hien
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
va nam » van nam, ha nam, va nay
vi hoc » li hoc, va hoc

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 lang) OR (ky nang)) xa hoi. hieu va nam truoc va hanh vi hoc viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat tac ((ky lang) OR (ky nang)) xa hoi. hieu va nam truoc va hanh vi hoc viet".
• Adding a wildcard symbol may retrieve word variants: thuat tac ((ky lang) OR (ky nang)) xa hoi. hieu va nam truoc va hanh vi hoc viet*.