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