Perhaps you should try some spelling variations:
tinh vai » tinh va, tinh bai, tinh lai
tinh hai » tinh thai, tinh chat, trinh han
cua tre » cua te, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
cuu tre » cau tren, cau treo
ve cac » va cac, vien cac

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 ky dang xa hoi. hieu ve cac duc va ((tinh vai) OR (tinh hai)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. hieu ve cac duc va ((tinh vai) OR (tinh hai)) ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. hieu ve cac duc va ((tinh vai) OR (tinh hai)) ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. hieu ve cac duc va ((tinh vai) OR (tinh hai)) ((cua tre) or (cuu tre))*.