Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nang cau » nang cao, hang cau, nang dau
tu sach » thu sach, su sach, te sach
cau hoa » cau hoi
hieu ve » hieu va, hieu van
va hang » van hang, va nang, va lang
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du

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 y nang cau hoa. hieu ve cac tu va hang va ((cua tre) OR (cua triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang cau hoa. hieu ve cac tu va hang va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang cau hoa. hieu ve cac tu va hang va ((cua tre) OR (cua triet))*.