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