Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tinh vi » trinh vi, tinh voi, tinh va
va tinh » may tinh
sach ky » sach y, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
vi cau » va cau, ve cau, di cau
ve coc » ve cuoc, ve cac
ve co » vo co, va co, de co

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sac ky)) lang xa hoi. hieu ((ve coc) or (ve co)) luc va tinh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) lang xa hoi. hieu ((ve coc) OR (ve co)) luc va tinh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) lang xa hoi. hieu ((ve coc) or (ve co)) luc va tinh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) lang xa hoi. hieu ((ve coc) or (ve co)) luc va tinh vi cau tren*.