Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, thai thuc
cua triet » cua viet, su triet, va triet
tam thuc » am thuc, nam thuc, dam thuc
va thanh » gia thanh, ban thanh, va tinh
thanh ve » hanh ve, thanh va, thanh vien
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
ve cua » le cua, de cua, te cua

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: su ((sach ky) OR (sac ky)) nang xa hoi. lieu va ((tham thuc) OR (tam thuc)) va thanh ve cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) nang xa hoi. lieu va ((tham thuc) OR (tam thuc)) va thanh ve cua triet~".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang xa hoi. lieu va ((tham thuc) OR (tam thuc)) va thanh ve cua triet*.