Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau trung » cau truong, cac trung, cao trung
xanh doi » xanh di, thanh doi, tinh doi
dang cay » dang xay, dang ca, dang cac
hieu van » hieu va, thien van, lieu va
trung ha » trung hoc, trung tam, trung cap
cua tre » cua te, cuu tre, dua tren
ha xanh » ha anh, ha manh, ha canh
sach ty » sach tu, sach thu, xach tay
cay cho » cap cho, cao cho, cay co
van cau » van dau, van hau, van chat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach y)) dang cay cho. hieu van cau trung ha xanh doi ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) dang cay cho. hieu van cau trung ha xanh doi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach y)) dang cay cho. hieu van cau trung ha xanh doi ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach y)) dang cay cho. hieu van cau trung ha xanh doi ((cua tre) OR (cua triet))*.