Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
hieu ve » hieu va, hieu van
cau tuc » cau truc, cau tu, cau luc
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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) OR (sach y)) nang x ho. ((hieu ve) or (hieu qua)) cau tuc va tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang x ho. ((hieu ve) OR (hieu qua)) cau tuc va tinh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) nang x ho. ((hieu ve) or (hieu qua)) cau tuc va tinh di cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) nang x ho. ((hieu ve) or (hieu qua)) cau tuc va tinh di cua tre*.