Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
cac toc » cac toi, cac nuoc, cac thoi
dan thi » dang thi, tran thi, dinh thi
toc va » hoc va, toc ta, tuc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang x) or (nang ma)) hoi. lieu va cac toc va ((dan thi) or (cau thi)) cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang x) OR (nang ma)) hoi. lieu va cac toc va ((dan thi) OR (cau thi)) cau treo.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang x) or (nang ma)) hoi. lieu va cac toc va ((dan thi) or (cau thi)) cau treo*.