Perhaps you should try some spelling variations:
nhan loc » nhan luc, nhan hoc, nhan loai
nang dai » nang dau, nang tai, nang cai
lang dai » lang hai, lang mai, lang chai
hanh doi » thanh doi, hanh noi, hang doi
qua nhan » cua nhan, qua nhat, qua phan
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
su sach » so sach, vu sach
cuu tre » cau tren, cau treo
loc va » hoc va, luc 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 ((nang dai) OR (lang dai)) hoi. hieu qua nhan loc va hanh doi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang dai) OR (lang dai)) hoi. hieu qua nhan loc va hanh doi ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang dai) OR (lang dai)) hoi. hieu qua nhan loc va hanh doi ((cua tre) or (cuu tre))*".