Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
luoc can » luc canh, hoc can, luoc dai
dang xay » dang van, van xay
duc van » duc va, duc tan, duc manh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
vi va » vi van, vai va, vu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((nang xa) or (dang xay)) hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang xa) OR (dang xay)) hoi. hieu ve cac ((duc van) OR (luoc can)) hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang xa) or (dang xay)) hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi va triet*.