Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
chat xuc » chat huu, cam xuc, chao xu
sinh dai » sinh thai, si dai, sinh vat
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va sinh » va kinh, va tinh, vi sinh
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach y) or (sac ky)) nang xa hoi. ((hieu van) or (hieu va)) chat xuc va sinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach y) OR (sac ky)) nang xa hoi. ((hieu van) OR (hieu va)) chat xuc va sinh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu ((sach y) or (sac ky)) nang xa hoi. ((hieu van) or (hieu va)) chat xuc va sinh dai cua tre*.