Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
van chat » cao chat
truc va » thuc va, trung va
sach ly » sach y, sach lo, sach ty
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet

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 ly ((nang xa) or (nang ma)) hoi. hieu van chat ((truc va) OR (thuc vat)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly ((nang xa) OR (nang ma)) hoi. hieu van chat ((truc va) OR (thuc vat)) hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly ((nang xa) or (nang ma)) hoi. hieu van chat ((truc va) OR (thuc vat)) hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ly ((nang xa) or (nang ma)) hoi. hieu van chat ((truc va) OR (thuc vat)) hanh dai cua tre*.