Perhaps you should try some spelling variations:
cao minh » chi minh, van minh
dao minh » van minh, duc minh, dao hanh
cac thuc » cach thuc, cac thu, can thuc
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
thuc ca » thuc cua, thuc can, thuc cao
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc ((sach ky) or (sac ky)) nang ma hoi. hieu ve cac thuc ca ((dao minh) OR (cao minh)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc ((sach ky) OR (sac ky)) nang ma hoi. hieu ve cac thuc ca ((dao minh) OR (cao minh)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc ((sach ky) or (sac ky)) nang ma hoi. hieu ve cac thuc ca ((dao minh) OR (cao minh)) cau tren".
• Adding a wildcard symbol may retrieve word variants: nuoc ((sach ky) or (sac ky)) nang ma hoi. hieu ve cac thuc ca ((dao minh) OR (cao minh)) cau tren*.