Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
doi cua » dai cua, hoi cua
ve tham » va tham, ve cham, vi tham
sach ky » sac ky, sach ty, sach kem
hieu ve » hieu va, hieu van
cao hoi » cau hoi, co hoi, cao hoc
di cua » dai cua, de cua, do 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 ky) or (sach y)) nang cao hoi. hieu ve tham thuc day hanh ((di cua) OR (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sach y)) nang cao hoi. hieu ve tham thuc day hanh ((di cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sach y)) nang cao hoi. hieu ve tham thuc day hanh ((di cua) OR (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sach y)) nang cao hoi. hieu ve tham thuc day hanh ((di cua) OR (doi cua)) tre*.