Perhaps you should try some spelling variations:
su sach » so sach, vu sach
tinh di » tinh doi, trinh di, tinh da
va tinh » may tinh
cau luc » cau truc, cau phuc
sach ty » sach y, sach tu, sach thu
cau tuc » cau truc, cau tu, cau phuc
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
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 nang x ho. ((hieu ve) or (hieu qua)) ((cau tuc) OR (cau luc)) va tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x ho. ((hieu ve) OR (hieu qua)) ((cau tuc) OR (cau luc)) va tinh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang x ho. ((hieu ve) or (hieu qua)) ((cau tuc) OR (cau luc)) va tinh di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x ho. ((hieu ve) or (hieu qua)) ((cau tuc) OR (cau luc)) va tinh di cua tre*.