Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cac tren » ca tren, rac tren, tac tren
nhan luc » nang luc
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
va nhan » van nhan, ca nhan, va phan
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: su sach y ((mang xa) or (nang ma)) hoi. lieu va nhan luc va hanh va ((cac tren) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((mang xa) OR (nang ma)) hoi. lieu va nhan luc va hanh va ((cac tren) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((mang xa) or (nang ma)) hoi. lieu va nhan luc va hanh va ((cac tren) OR (cau tren))*".