Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
vat hanh » vat thanh, van hanh, va hanh
hanh tai » thanh tai, hang tai, han tai
cau tren » cu tren, dau tren, cau treo
dang mai » dang hai, dang mau, dang bai
mai khoa » tai khoa, may khoa, dai khoa
cuu tre » cua tre, cau treo
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ca tren » cu tren, la tren, co tren

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 dang mai khoa. hieu ve cham thuc vat hanh tai ((cuu tre) or (((cau tren) OR (ca tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky dang mai khoa. hieu ve cham thuc vat hanh tai ((cuu tre) OR (((cau tren) OR (ca tren)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky dang mai khoa. hieu ve cham thuc vat hanh tai ((cuu tre) or (((cau tren) OR (ca tren))))".
• Adding a wildcard symbol may retrieve word variants: te sach ky dang mai khoa. hieu ve cham thuc vat hanh tai ((cuu tre) or (((cau tren) OR (ca tren))))*.