Perhaps you should try some spelling variations:
dang xay » dang van, van xay
qua nhan » cua nhan, qua nhat, qua phan
nhan luc » nang luc
su sach » so sach, vu sach
te sach » toc sach
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
va tinh » may tinh
tinh di » tinh doi, trinh di, tinh da
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
di cua » dai cua, doi cua, de cua

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) or (te sach)) ky dang xay hoi. hieu qua nhan luc va tinh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky dang xay hoi. hieu qua nhan luc va tinh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky dang xay hoi. hieu qua nhan luc va tinh di cua tre*.