Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
thanh va » thanh van, hanh va, thanh ha
thanh vi » hanh vi, thanh ve, nhanh vi
tu sach » thu sach, su sach, te sach
luc ban » duc ban, cuc ban, luc bat
hieu va » lieu va, hieu qua
hieu ve » hieu van
sang ma » tang ma, nang ma, sang tao
y sang » _ sang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa

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