Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
dang xay » dang van, van xay
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
ve cauc » ve cac
toc sac » toc sach, toc san, hoc sach
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
dao va » dao van, tao va, do va
ve cau » ke cau, va cau, ve cac
di va » dai va, di vao, doi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky ((nang xa) or (dang xay)) hoi. hieu ((ve cau) or (ve cauc)) dao va hanh di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky ((nang xa) OR (dang xay)) hoi. hieu ((ve cau) OR (ve cauc)) dao va hanh di va triet.
• Adding a wildcard symbol may retrieve word variants: toc sac ky ((nang xa) or (dang xay)) hoi. hieu ((ve cau) or (ve cauc)) dao va hanh di va triet*.