Perhaps you should try some spelling variations:
nhan luc » nang luc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
han tai » hang tai, nhan tai, van tai
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
luc va » duc va, tuc va, loc va
va han » va phan, van han, va hanh
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((x hoi) or (x ho)). ((hieu va) OR (lieu va)) nhan luc va han tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (x ho)). ((hieu va) OR (lieu va)) nhan luc va han tai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x hoi) or (x ho)). ((hieu va) OR (lieu va)) nhan luc va han tai cuu tre*".