Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
thi cau » thi chau, thi cu, thi cam
dau thi » cau thi, dan thi, dao thi
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 ky ((nang xa) or (nang ma)) hoi. lieu va cac ((xuc va) OR (tuc va)) dau thi cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. lieu va cac ((xuc va) OR (tuc va)) dau thi cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (nang ma)) hoi. lieu va cac ((xuc va) OR (tuc va)) dau thi cau treo".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang ma)) hoi. lieu va cac ((xuc va) OR (tuc va)) dau thi cau treo*.