Perhaps you should try some spelling variations:
sach ty » sach tu, sach thu, xach tay
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
dau tuc » dau tu, dao tuc, cau truc
hoa hoi » khoa hoi, hoa hoc, hoa doi
cua tre » cua te, cuu tre, cua triet
ha hoi » ha noi, xa hoi, va hoi
va dau » va dao
tuc va » thuc va, truc va, tuc xa
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) or (sach y)) lang ((ha hoi) OR (hoa hoi)). lieu va dau tuc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) lang ((ha hoi) OR (hoa hoi)). lieu va dau tuc va hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) lang ((ha hoi) OR (hoa hoi)). lieu va dau tuc va hanh di cua tre*".