Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
lang mai » lang dai, lang hai, lang man
mai khoa » tai khoa, may khoa, dai khoa
vat hanh » vat thanh, van hanh, va hanh
hanh tai » thanh tai, hang tai, han tai
cau tren » cu tren, dau tren, ca tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cuu tre » cua tre, 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: te sach ky lang mai khoa. hieu ve cham thuc vat hanh tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang mai khoa. hieu ve cham thuc vat hanh tai ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach ky lang mai khoa. hieu ve cham thuc vat hanh tai ((cuu tre) or (cau tren))*.