Perhaps you should try some spelling variations:
phan dau » phan tu, hang dau
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ke » hieu kem, chieu ke, hieu ve
dau van » dao van, dam van, dau va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang xa hoi. ((hieu ke) or (hieu ky)) phan dau van hanh (kem or kiem) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu ke) OR (hieu ky)) phan dau van hanh (kem OR kiem) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((hieu ke) or (hieu ky)) phan dau van hanh (kem or kiem) su triet*.