Perhaps you should try some spelling variations:
hanh tri » thanh tri, hanh tai, hanh trinh
chat luc » chat xuc, chat lua, nhan luc
tu sach » thu sach, su sach, te sach
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
luc va » duc va, tuc va, loc va
cua te » cua tu

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

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