Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
lang mai » lang dai, lang hai, lang man
mai khoa » tai khoa, may khoa, dai khoa
van dung » van dong, xay dung, tin dung
cuu tre » cua tre, cau tren
xuc van » duc van, luc van, vuc van
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac
ve cam » ve cham, va cam, ve cai

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 cam) OR (ve cac)) xuc van dung tai ((cuu tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang mai khoa. hieu ((ve cam) OR (ve cac)) xuc van dung tai ((cuu tre) OR (cau treo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang mai khoa. hieu ((ve cam) OR (ve cac)) xuc van dung tai ((cuu tre) or (cau treo))".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang mai khoa. hieu ((ve cam) OR (ve cac)) xuc van dung tai ((cuu tre) or (cau treo))*.