Perhaps you should try some spelling variations:
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
qua cau » quan cau, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
va cua » va chua, via cua, ma cua
ca cua » co cua

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 (sac ky)) nang ma hoi. hieu qua cau truc va hanh ((va cua) or (ca cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) nang ma hoi. hieu qua cau truc va hanh ((va cua) OR (ca cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) nang ma hoi. hieu qua cau truc va hanh ((va cua) or (ca cua)) triet*.