Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh lai » tinh lao, tinh hai, minh lai
cac thuc » cach thuc, cac thu, can thuc
tu sach » thu sach, su sach, te sach
va tinh » may tinh
cua tre » cua te, cuu tre, dua tren
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 nang o hoi. hieu ve cac thuc va tinh lai ((((cua tre) or (cua triet))) or (cau tao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hoi. hieu ve cac thuc va tinh lai ((((cua tre) OR (cua triet))) OR (cau tao)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hoi. hieu ve cac thuc va tinh lai ((((cua tre) or (cua triet))) or (cau tao))*.