Perhaps you should try some spelling variations:
tinh doi » trinh doc, trinh do, tinh hoc
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
cau tuc » cau truc, cau tu, cau luc
va tinh » may tinh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
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: su sach ty nang x ho. ((hieu ve) or (hieu qua)) cau tuc va tinh doi 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 va tinh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x ho. ((hieu ve) or (hieu qua)) cau tuc va tinh doi cua tre*.