Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
nang mai » nang ma, nang tai, lang mai
mai khoa » tai khoa, may khoa, dai khoa
cam thuc » am thuc, nam thuc, cam thu
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
vai cua » dai cua, bai cua, mai cua
bo sach » co sach, hoc sach
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
sach v » sach va, sach y, sach 2
ve cam » ve cham, ve cac, va cam
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach v nang mai khoa. hieu ve cam thuc va thanh ((((vai cua) OR (lai cua))) or (hai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach v nang mai khoa. hieu ve cam thuc va thanh ((((vai cua) OR (lai cua))) OR (hai cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach v nang mai khoa. hieu ve cam thuc va thanh ((((vai cua) OR (lai cua))) or (hai cua)) viet".
• Adding a wildcard symbol may retrieve word variants: bo sach v nang mai khoa. hieu ve cam thuc va thanh ((((vai cua) OR (lai cua))) or (hai cua)) viet*.