Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
dam thuc » am thuc, dan thuc, nam thuc
sach ky » sac ky, sach y, sach kem
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
sach ty » sach y, sach tu, sach thu
ma hoi » mai hoi, xa hoi, ma hoa
tai va » thai va, mai va, tri va
thiet* » thieu*

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) OR (sach ty)) sang ma hoi. hieu va ((dam thuc) or (cam xuc)) va hanh tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach ty)) sang ma hoi. hieu va ((dam thuc) OR (cam xuc)) va hanh tai va thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sach ty)) sang ma hoi. hieu va ((dam thuc) or (cam xuc)) va hanh tai va thiet*".