Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
ve cauc » ve cac
hanh di » hanh vi, hanh de, hang di
dao van » do van, dang van
toc sac » toc sach, toc san, hoc sach
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
ve cau » ke cau, va cau, ve cac
sac ky » cac ky, sai ky
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 (lang xa)) hoi. hieu ((ve cau) or (ve cauc)) dao van hanh di va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky ((nang xa) OR (lang xa)) hoi. hieu ((ve cau) OR (ve cauc)) dao van hanh di va triet.
• Adding a wildcard symbol may retrieve word variants: toc sac ky ((nang xa) or (lang xa)) hoi. hieu ((ve cau) or (ve cauc)) dao van hanh di va triet*.