Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
su triet » su viet, su tien, ve triet
hieu le » hieu ve, hieu he, hieu ly
thu vat » thuc vat, thu va, thuat vat
sac ky » sai ky
ha hoi » hoa hoi, xa hoi, va hoi
le nam » ly nam, he nam, le na
vi su » va su, ve su, ki su

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) lang ((ha hoi) OR (ha noi)). hieu le nam thu vat hanh vi su triet~.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (cac ky)) lang ((ha hoi) or (ha noi)). hieu le nam thu vat hanh vi su triet*.