Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
cau tren » cu tren, ca tren, cau treo
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
ly hang » ly quang
ve cap » ve cac, le cap, ve cau
ve cai » va cai, ve cac, ve tai
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 cap) OR (ve cai)) nuoc va hanh va ((cau tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly hang x hoi. hieu ((ve cap) OR (ve cai)) nuoc va hanh va ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly hang x hoi. hieu ((ve cap) OR (ve cai)) nuoc va hanh va ((cau tren) or (dau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ly hang x hoi. hieu ((ve cap) OR (ve cai)) nuoc va hanh va ((cau tren) or (dau tren))*.