Perhaps you should try some spelling variations:
nhan hang » ngan hang, nhan dang, nha hang
luc nhan » luc nhat, cu nhan, tue nhan
sach ty » sach tu, sach thu, xach tay
hang vi » hang va, hanh vi, hang di
cu tren » tu tren, dua tren
xang xa » lang xa, mang xa, ang xa
ve cau » ke cau, va cau, le cau
ve cac » va cac, vien cac
vi cu » vi su, vi xu, vi du

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