Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, cam thu
tang van » dang van, hoang van, trong van
sach ky » sac ky, sach y, sach ty
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
tang ma » mang may
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
va cua » va chua, via cua, ca cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((nang xa) or (((tang ma) OR (tang van)))) hoi. hieu ve cam thuc va tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (((tang ma) OR (tang van)))) hoi. hieu ve cam thuc va tinh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (((tang ma) OR (tang van)))) hoi. hieu ve cam thuc va tinh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (((tang ma) OR (tang van)))) hoi. hieu ve cam thuc va tinh va cua tre*.