Perhaps you should try some spelling variations:
thien van » thi van
hoang van » hang va
lang van » dang van, tang van, giang van
hieu van » hieu va, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cua van » cua ban, cua vat, cua dan
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((lang van) OR (hoang van)) hoi. ((hieu van) or (thien van)) nam cua van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang van) OR (hoang van)) hoi. ((hieu van) OR (thien van)) nam cua van hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang van) OR (hoang van)) hoi. ((hieu van) or (thien van)) nam cua van hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang van) OR (hoang van)) hoi. ((hieu van) or (thien van)) nam cua van hanh di cua tre*.