Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach thu » sach thue, sach thieu, sach tham
sach ty » sach y, sach tu, xach tay
cuu tre » cua tre, cau treo
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
dau tuc » dau tu, dao tuc, cau truc
va dau » va dao
tuc va » thuc va, truc va, tuc xa
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: vu ((sach ty) or (sach thu)) nang x hoi. lieu va dau tuc va hanh di ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ty) OR (sach thu)) nang x hoi. lieu va dau tuc va hanh di ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ty) or (sach thu)) nang x hoi. lieu va dau tuc va hanh di ((cuu tre) OR (cau tren))*".