Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thanh tai » thanh hai, thanh toan, doanh tai
cau tren » cu tren, dau tren, ca tren
dua tren » dung tren
va thanh » gia thanh, ban thanh, va tinh
dang xay » dang van, van xay
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thuat
xay hoi » xa hoi, tay hoi, cay phoi
thuc va » thuc vat, thuc dan, thuc day
ky dang » ky nang, ky danh
cuu tre » cua tre, cau treo
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 dang xay hoi. hieu va tham thuc va thanh tai ((dua tren) or (((cuu tre) or (cau tren))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky dang xay hoi. hieu va tham thuc va thanh tai ((dua tren) OR (((cuu tre) OR (cau tren)))).
• Adding a wildcard symbol may retrieve word variants: te sai ky dang xay hoi. hieu va tham thuc va thanh tai ((dua tren) or (((cuu tre) or (cau tren))))*.