Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
cua triet » cua viet, su triet, va triet
hanh lai » hanh lam, hanh tai, thanh lap
bien cac » vien cac, dien cac, bien ca
mai khoi » mai khoa, tai khoa, cac khoi
mai hoi » dai hoi, lai hoi, mai doi
sach ky » sach y, sach ty, sach kem
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) or (sac ky)) nang ((mai hoi) OR (mai khoi)). thieu bien cac tuc va hanh lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang ((mai hoi) OR (mai khoi)). thieu bien cac tuc va hanh lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sac ky)) nang ((mai hoi) OR (mai khoi)). thieu bien cac tuc va hanh lai cua triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sac ky)) nang ((mai hoi) OR (mai khoi)). thieu bien cac tuc va hanh lai cua triet*.