Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
hanh di » hanh vi, hanh de, hang di
sach lo » sach dao, sach doi, sach hoi
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
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 lo ((nang xa) or (nang ma)) hoi. hieu va 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 lo ((nang xa) OR (nang ma)) hoi. hieu va cam ((duc va) OR (thuc vat)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach lo ((nang xa) or (nang ma)) hoi. hieu va cam ((duc va) or (thuc vat)) hanh di cua tre*.