Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, tu cach
te sach » toc sach
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
hieu su » hieu sau, tieu su, hieu so
nha luc » nhan luc, nha nuoc, nham muc

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) or (te sach)) ly nang xa hoi. hieu su nha luc ((van hanh) OR (van thanh)) va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ly nang xa hoi. hieu su nha luc ((van hanh) OR (van thanh)) va su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ly nang xa hoi. hieu su nha luc ((van hanh) OR (van thanh)) va su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ly nang xa hoi. hieu su nha luc ((van hanh) OR (van thanh)) va su triet*.