Perhaps you should try some spelling variations:
truc ngan » tu ngan, thu ngan, tri ngan
cac truc » cau truc, cac tru, cac trung
cau tren » cu tren, dau tren, cau treo
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
hang vi » hanh vi, hang di, khang voi
ca tren » cu tren, la tren, co tren
ve cac » va cac, vien cac

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 ty xang xa hoi. hieu ve cac truc ngan ((hang vi) or (hang va)) ((ca tren) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang xa hoi. hieu ve cac truc ngan ((hang vi) OR (hang va)) ((ca tren) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty xang xa hoi. hieu ve cac truc ngan ((hang vi) or (hang va)) ((ca tren) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang xa hoi. hieu ve cac truc ngan ((hang vi) or (hang va)) ((ca tren) OR (cau tren))*.