Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
chat cua » nhat cua, chat va, chat huu
nhan luc » nang luc
su sach » so sach, vu sach
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, ma hoa, me hoi
va cua » va chua, via cua, ca 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 thi hanh ((ma hoi) or (xa hoi)). hieu va ((nhan luc) or (chat cua)) va tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thi hanh ((ma hoi) OR (xa hoi)). hieu va ((nhan luc) OR (chat cua)) va tinh va cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach thi hanh ((ma hoi) or (xa hoi)). hieu va ((nhan luc) or (chat cua)) va tinh va cua tre*.