Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cam thuc » am thuc, nam thuc, cam thu
vat hanh » vat thanh, van hanh, va hanh
mang xa » lang xa, mang may, dang xay
hieu ve » hieu va, hieu van
va chua » vua chua, ca chua, va chu
ve cam » ve cham, ve cac, va cam
va cua » via cua, ca cua, ma cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((mang xa) or (nang x)) hoi. hieu ve cam thuc vat hanh ((va cua) or (va chua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((mang xa) OR (nang x)) hoi. hieu ve cam thuc vat hanh ((va cua) OR (va chua)) tu.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((mang xa) or (nang x)) hoi. hieu ve cam thuc vat hanh ((va cua) or (va chua)) tu*.