Perhaps you should try some spelling variations:
hanh dinh » thanh dinh, hinh dinh, hanh tinh
nam thuoc » nam thu, nha thuoc, cay thuoc
nam thuc » am thuc, nam thu, nam tu
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
dinh cu » dinh cuu, dinh chuc, dinh chau
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
lo nang » ho nang, ly nang, loai nang
cu tren » tu tren, dua tren
ma hoi » mai hoi, xa hoi, ma hoa

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) OR (thu sach)) lo nang ma hoi. hieu va ((nam thuc) or (nam thuoc)) va hanh dinh cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) lo nang ma hoi. hieu va ((nam thuc) OR (nam thuoc)) va hanh dinh cu tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) lo nang ma hoi. hieu va ((nam thuc) or (nam thuoc)) va hanh dinh cu tren*".