Perhaps you should try some spelling variations:
thuat tac » thuat tach, thuat tao, thuat tai
hieu van » hieu va, thien van, lieu va
thuoc va » thuc va, thuoc ma, thuong va
truoc va » truc va, truong va, truoc bua
hoc viet » hoc hien
nang xa » lang xa, nang ma, mang xa
van lam » van nam
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 ((nang xa) OR (nang x)) hoi. hieu van lam ((truoc va) or (thuoc va)) hanh vi hoc viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat tac ky ((nang xa) OR (nang x)) hoi. hieu van lam ((truoc va) OR (thuoc va)) hanh vi hoc viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat tac ky ((nang xa) OR (nang x)) hoi. hieu van lam ((truoc va) or (thuoc va)) hanh vi hoc viet".
• Adding a wildcard symbol may retrieve word variants: thuat tac ky ((nang xa) OR (nang x)) hoi. hieu van lam ((truoc va) or (thuoc va)) hanh vi hoc viet*.