Perhaps you should try some spelling variations:
manh xanh » mang xanh, anh anh, manh binh
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
xanh di » danh di, vanh dai, xanh tai
cao suc » cao su, cao duc
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
ve cao » va cao, ve bao, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (cac ky)) nang ma hoi. hieu ve cao suc manh xanh di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (cac ky)) nang ma hoi. hieu ve cao suc manh xanh di ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (cac ky)) nang ma hoi. hieu ve cao suc manh xanh di ((cua tre) or (cuu tre))*.