Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh tai » trinh tai, tinh thai, tinh hai
chat cuu » chat huu, chat cua, cham cuu
ve chat » va chat, van chat
cuc tre » duc tre, cua tre, cuu tre
va tinh » may tinh
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
mat hoi » mai hoi, sat hoi, luat hoi
ty hang » ly hang, ty xang, thi hang
hieu ve » hieu va, hieu van
cuu va » cuu van, cuu ve

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 ty hang ((mat hoi) OR (mat troi)). hieu ve chat cuu va tinh tai ((cuc tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty hang ((mat hoi) OR (mat troi)). hieu ve chat cuu va tinh tai ((cuc tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty hang ((mat hoi) OR (mat troi)). hieu ve chat cuu va tinh tai ((cuc tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty hang ((mat hoi) OR (mat troi)). hieu ve chat cuu va tinh tai ((cuc tre) or (cua triet))*.