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