Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cau tren » cu tren, ca tren, cau treo
cap nuoc » dat nuoc
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, te sach, tu cach
ly hang » ly quang
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
hang x » nang x, hoang xa, chang xu
ve cap » ve cac, le cap, ve cai
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: ((tu sach) OR (su sach)) ly hang x hoi. hieu ve cap nuoc va hanh va ((cau tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ly hang x hoi. hieu ve cap nuoc va hanh va ((cau tren) OR (dau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ly hang x hoi. hieu ve cap nuoc va hanh va ((cau tren) or (dau tren))*".