Perhaps you should try some spelling variations:
tinh hoc » sinh hoc, tin hoc, hinh hoc
tinh hoa » trinh hoa, minh hoa, thanh hoa
nhan luc » nang luc
sach ty » sach y, sach thu, xach tay
va nhan » van nhan, ca nhan, va phan
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ty) or (sach tu)) lang xa hoi. hieu va nhan luc va ((tinh hoa) OR (tinh hoc)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach tu)) lang xa hoi. hieu va nhan luc va ((tinh hoa) OR (tinh hoc)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) or (sach tu)) lang xa hoi. hieu va nhan luc va ((tinh hoa) OR (tinh hoc)) cua tre".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ty) or (sach tu)) lang xa hoi. hieu va nhan luc va ((tinh hoa) OR (tinh hoc)) cua tre*.