Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc va
tu sach » thu sach, su sach, te sach
hanh di » hanh vi, hanh de, hang di
duc van » duc va, duc tan, duc manh
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
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 ty ((nang xa) or (lang xa)) hoi. hieu va cao ((thuc van) or (duc van)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (lang xa)) hoi. hieu va cao ((thuc van) OR (duc van)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (lang xa)) hoi. hieu va cao ((thuc van) or (duc van)) hanh di cua tre*.