Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
cau tren » cu tren, dau tren, ca tren
sach ky » sach ty, sach kem, sach hay
va cham » va chat, va tham
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va
di cau » da cau, diem cau

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

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