Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
cau thuc » cau truc, cuu thuc, can thuc
va caua » va chua
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
va cau » van cau, va cac, va dau
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sai ky)) nang ma hoi. hieu va cau thuc vat hanh ((va caua) or (va cau)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sai ky)) nang ma hoi. hieu va cau thuc vat hanh ((va caua) OR (va cau)) triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sai ky)) nang ma hoi. hieu va cau thuc vat hanh ((va caua) or (va cau)) triet*.