Perhaps you should try some spelling variations:
thuat tac » thuat tach, thuat tao, thuat tai
nam truoc » nam thuoc, lam truoc, nam truc
hoc viet » hoc hien
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
tac ky » tac ke, cac ky, tap ky
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 xa hoi. hieu va nam truoc ((va hanh) OR (va danh)) vi hoc viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat tac ky lang xa hoi. hieu va nam truoc ((va hanh) OR (va danh)) vi hoc viet".
• Adding a wildcard symbol may retrieve word variants: thuat tac ky lang xa hoi. hieu va nam truoc ((va hanh) OR (va danh)) vi hoc viet*.