Perhaps you should try some spelling variations:
nhan luu » nhan luc, nhan luan, thanh luu
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
su viet » so viet

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