Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tang van » dang van, hoang van, trong van
hanh lam » thanh lap, hanh kem, hanh va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach
hieu vu » hieu va, hieu ve, hieu su
van hoe » van hoa, van hoc, van hieu
sach 7 » sach y, sach 2
7 tang » 6 tang

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 7 tang van hoe. hieu vu ((phan tu) or (cham soc)) va hanh lam ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 7 tang van hoe. hieu vu ((phan tu) OR (cham soc)) va hanh lam ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach 7 tang van hoe. hieu vu ((phan tu) or (cham soc)) va hanh lam ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach 7 tang van hoe. hieu vu ((phan tu) or (cham soc)) va hanh lam ((cua tre) OR (cua triet))*.