Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cau treo » cau theo, cau tren, cau triet
hanh tai » thanh tai, hang tai, han tai
cuu tre » cau tren
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sai ky » sac ky
te sai » te tai, te bai, te lai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky lang xa hoi. hieu va tham thuc va hanh tai ((cua tre) or (((cuu tre) OR (cau treo))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky lang xa hoi. hieu va tham thuc va hanh tai ((cua tre) OR (((cuu tre) OR (cau treo)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky lang xa hoi. hieu va tham thuc va hanh tai ((cua tre) or (((cuu tre) OR (cau treo))))".
• Adding a wildcard symbol may retrieve word variants: te sai ky lang xa hoi. hieu va tham thuc va hanh tai ((cua tre) or (((cuu tre) OR (cau treo))))*.