Perhaps you should try some spelling variations:
luat ngan » cua ngan, luat dan
luc ngan » luc nganh, luc nhan, vu ngan
cau tren » dau tren, ca tren, cau treo
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
hang vi » hang va, hanh vi, hang di
cu tren » tu tren, dua tren
sach ty » sach y, sach tu, sach thu
van cau » van dau, van hau, van chat
xang xa » lang xa, mang xa, ang xa

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