Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
luu tre » luu tru, cuu tre, luy tre
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
danh du » danh dau, danh tu, dinh du
va danh » va dinh, va dan, va hanh
lang ha » long ha
hieu va » lieu va, hieu qua
va cham » va chat, va tham
du luu » duoc luu
luc va » duc va, tuc va, loc va
su sac » su cac, su xac

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

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