Perhaps you should try some spelling variations:
luat ngan » cua ngan, luat dan
dai tren » dat tren, dau tren, dan tren
luc ngan » luc nganh, luc nhan, vu ngan
sach ty » sach tu, sach thu, xach tay
hang vi » hang va, hanh vi, hang di
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
vi dai » si dai, li dai, vien dai
ve cam » ve cham, ve cac, va cam

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