Perhaps you should try some spelling variations:
tham doc » than doc, tham do, tham nuoc
xay hoi » xa hoi, tay hoi, cay phoi
sach ty » sach y, sach tu, sach thu
thi van » thi lan, thi hanh, thi nang
doc may » hoc may, do may
tinh vi » trinh vi, tinh voi, tinh va
cuu tre » cua tre, cau tren, cau treo
sac ky » cac ky, sai ky
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sach ty)) van xay hoi. ((thi van) or (hieu qua)) tham doc may tinh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach ty)) van xay hoi. ((thi van) OR (hieu qua)) tham doc may tinh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sach ty)) van xay hoi. ((thi van) or (hieu qua)) tham doc may tinh vi cuu tre*.