Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
vat hanh » vat thanh, van hanh, va hanh
so sach » so sanh, bo sach, co sach
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
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: so sach ((thu nang) or (thu hang)) ma hoi. hieu ve pham thuc vat hanh ((vai cua) OR (hai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thu nang) OR (thu hang)) ma hoi. hieu ve pham thuc vat hanh ((vai cua) OR (hai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((thu nang) or (thu hang)) ma hoi. hieu ve pham thuc vat hanh ((vai cua) OR (hai cua)) te".
• Adding a wildcard symbol may retrieve word variants: so sach ((thu nang) or (thu hang)) ma hoi. hieu ve pham thuc vat hanh ((vai cua) OR (hai cua)) te*.