Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
vu sach » vu bach, su sach, vu khach
hanh di » hanh vi, hanh de, hang di
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet
sach o » sach lo, sac o, sach y
ve cam » ve cham, ve cac, va cam
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: vu sach o ((lang xa) OR (lang van)) hoi. hieu ve cam ((duc va) or (thuc vat)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach o ((lang xa) OR (lang van)) hoi. hieu ve cam ((duc va) OR (thuc vat)) hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach o ((lang xa) OR (lang van)) hoi. hieu ve cam ((duc va) or (thuc vat)) hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach o ((lang xa) OR (lang van)) hoi. hieu ve cam ((duc va) or (thuc vat)) hanh di cua tre*.