Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
su sach » so sach, vu sach
va tinh » may tinh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
vi cuu » vinh cuu
vi luu » vi lua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky nang ma hoi. hieu ve cham thuc va tinh ((vi cuu) OR (vi luu)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky nang ma hoi. hieu ve cham thuc va tinh ((vi cuu) OR (vi luu)) tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky nang ma hoi. hieu ve cham thuc va tinh ((vi cuu) OR (vi luu)) tre*.