Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
thanh vi » thanh va, thanh ve, nhanh vi
vu sach » vu bach, su sach, vu khach
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
luc van » luoc van, luu van, duc van
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y ((nang xa) or (nang cao)) hoi. lieu va cham luc van ((thanh vi) OR (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y ((nang xa) OR (nang cao)) hoi. lieu va cham luc van ((thanh vi) OR (hanh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach y ((nang xa) or (nang cao)) hoi. lieu va cham luc van ((thanh vi) OR (hanh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (nang cao)) hoi. lieu va cham luc van ((thanh vi) OR (hanh vi)) cuu tre*.