Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
sach kem » hanh kem
va hanh » van hanh, va thanh, va danh
bao duc » dao duc, bao luc, cao duc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
su viet » so viet
sach ky » sach y, sach ty, sach hay
sac ky » cac ky, sai ky
ve bao » te bao, va bao
doi su » oi su, don su, voi su

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 ky) or (sach kem))) or (sac ky)) nang xa hoi. hieu ve bao duc va hanh doi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((((sach ky) OR (sach kem))) OR (sac ky)) nang xa hoi. hieu ve bao duc va hanh doi su viet.
• Adding a wildcard symbol may retrieve word variants: tu ((((sach ky) or (sach kem))) or (sac ky)) nang xa hoi. hieu ve bao duc va hanh doi su viet*.