Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
dau tuc » dau tu, dao tuc, cau truc
lua tre » cua tre, dua tren, luat tri
tuc van » thuc van, truc van, tuc va
luy tre » luyen tre
sach ty » sach y, sach tu, xach tay
hang xa » hoang xa, hang va, hang ca
va dau » va dao

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