Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
sach ty » sach tu, xach tay, sach hay
hang xa » hoang xa, hang va, hang ca
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
luu tre » luu tru, cuu tre, luy tre
va dau » va dao
vi luu » vi lua

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 thu))) or (sach y)) hang xa hoi. lieu va dau tuc van hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach ty) OR (sach thu))) OR (sach y)) hang xa hoi. lieu va dau tuc van hanh vi luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((((sach ty) OR (sach thu))) or (sach y)) hang xa hoi. lieu va dau tuc van hanh vi luu tre*".