Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dieu kien » dieu khien, dien bien
dinh vai » dinh van, dinh vi, dinh va
sach thu » sach thue, sach thieu, sach tham
kien cac » vien cac, dien cac, kien mac
sang ma » tang ma, nang ma, sang tao
mang xa » lang xa, mang may, dang xay
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va

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 thu ((mang xa) or (sang ma)) hoi. dieu kien cac lo va dinh vai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((mang xa) OR (sang ma)) hoi. dieu kien cac lo va dinh vai ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach thu ((mang xa) or (sang ma)) hoi. dieu kien cac lo va dinh vai ((cua tre) or (cua triet))*.