Perhaps you should try some spelling variations:
thieu bien » thieu nien, hien bien, hieu hien
va triet » va thiet, va trien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
lai va » loai va, mai va, dai va

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