Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
nam xuc » cam xuc, nam xua, nam thuc
xuc may » xuc hay, truc may, phuc may
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sac ky) or (sach ty)) nang x hoi. hieu van nam xuc may tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sach ty)) nang x hoi. hieu van nam xuc may tinh di cua tre.
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sach ty)) nang x hoi. hieu van nam xuc may tinh di cua tre*.