Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
lam cua » nam cua, lam chat
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
van hoi » van hoc, van hoe, van loi
cua tre » cua te, cuu tre, cua triet

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