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

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 v nang mai khoi. hieu ve cam thuc va tinh ((bai cua) or (hai cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach v nang mai khoi. hieu ve cam thuc va tinh ((bai cua) OR (hai cua)) viet.
• Adding a wildcard symbol may retrieve word variants: so sach v nang mai khoi. hieu ve cam thuc va tinh ((bai cua) or (hai cua)) viet*.