Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
hieu van » hieu va, thien van, lieu va
cau treo » cau tren, cau triet, cau trieu
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
van chat » cao chat
sach ty » sach y, sach tu, sach thu
xuc van » duc van, luc van, vuc van
nang xa » lang xa, nang ma, mang xa
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang xa) or (nang x)) hoi. hieu van chat xuc van hanh tai ((cau treo) OR (cau theo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang x)) hoi. hieu van chat xuc van hanh tai ((cau treo) OR (cau theo)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (nang x)) hoi. hieu van chat xuc van hanh tai ((cau treo) OR (cau theo))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang x)) hoi. hieu van chat xuc van hanh tai ((cau treo) OR (cau theo))*.