Perhaps you should try some spelling variations:
hanh than » hanh han, hanh nhan, hanh phan
than cua » nhan cua, thai cua, ban cua
van hanh » van thanh, ban hanh, van anh
dang xay » dang van, van xay
hieu van » hieu va, thien van, lieu va
xuc van » duc van, luc van, vuc van
van bac » van ban, van bao, van hac
cua tre » cua te, cuu tre, cua triet
sach ty » sach tu, sach thu, xach tay

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) OR (sach y)) ((dang xay) OR (mang may)) hoi. hieu van bac xuc van hanh than cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) ((dang xay) OR (mang may)) hoi. hieu van bac xuc van hanh than cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) ((dang xay) OR (mang may)) hoi. hieu van bac xuc van hanh than cua tre*.