Perhaps you should try some spelling variations:
diem cau » dieu can
cham luc » cham soc, nhan luc, cham cuu
lang xa » lang ha, dang xay, lang van
va cham » va chat, va tham
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
sai ky » sac ky
luc va » duc va, tuc va, loc va
di cau » da 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 (sai ky)) lang xa hoi. lieu va cham luc va tinh ((di cau) OR (diem cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (sai ky)) lang xa hoi. lieu va cham luc va tinh ((di cau) OR (diem cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach ky) or (sai ky)) lang xa hoi. lieu va cham luc va tinh ((di cau) OR (diem cau)) tren".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) or (sai ky)) lang xa hoi. lieu va cham luc va tinh ((di cau) OR (diem cau)) tren*.