Perhaps you should try some spelling variations:
van cham » van chat, van tham, va cham
phan dau » phan tu, hang dau
phan cau » phan cac, phan tu, phan lap
va thanh » gia thanh, ban thanh, va tinh
cham luc » cham soc, nhan luc, cham cuu
hieu van » hieu va, thien van, lieu va
lang xa » lang ha, dang xay, lang van
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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

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