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