Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
lmay nang » luan nang, may nong, day nang
may nang » may nong, ky nang, cam nang
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
cua tre » cua te, cua triet, dua tren
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
cuu tre » cau tren, cau treo

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 ((may nang) or (lmay nang)) x ho. hieu ve cham thuc day hanh di ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((may nang) OR (lmay nang)) x ho. hieu ve cham thuc day hanh di ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ((may nang) or (lmay nang)) x ho. hieu ve cham thuc day hanh di ((cua tre) or (cuu tre))*.