Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty sang » ty xang, ty hang, duy sang
hieu va » lieu va, hieu qua
va cham » va chat, va tham
luc ban » duc ban, cuc ban, luc bat
vai cua » hai cua, lai cua, bai cua
ma hoi » mai hoi, ma hoa, me hoi

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 sang ((ma hoi) or (xa hoi)). hieu va cham luc ban hanh ((vai cua) OR (dai cua)) vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty sang ((ma hoi) OR (xa hoi)). hieu va cham luc ban hanh ((vai cua) OR (dai cua)) vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty sang ((ma hoi) or (xa hoi)). hieu va cham luc ban hanh ((vai cua) OR (dai cua)) vat".
• Adding a wildcard symbol may retrieve word variants: tu sach ty sang ((ma hoi) or (xa hoi)). hieu va cham luc ban hanh ((vai cua) OR (dai cua)) vat*.