Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
hoc sach » hoc sinh, hoc cac, hoc anh
dinh cuu » dinh chi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
va cham » va chat, va tham
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
di cuu » di cau, di cua

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: hoc sach ty ((nang x) OR (lang xa)) hoi. hieu va cham thuc va hanh ((di cuu) OR (dinh cuu)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ty ((nang x) or (lang xa)) hoi. hieu va cham thuc va hanh ((di cuu) OR (dinh cuu)) tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ty ((nang x) or (lang xa)) hoi. hieu va cham thuc va hanh ((di cuu) OR (dinh cuu)) tre*.