Perhaps you should try some spelling variations:
doanh vien » doanh tien, doanh chien, thanh vien
danh viet » anh viet, ninh viet, nang viet
cua truc » cua tuc, cua thuoc, cua trung
lang xa » lang ha, dang xay, lang van
sach ky » sach y, sach ty, sach kem
truc va » thuc va, thuc vat, trung va
qua cua » quan cua, quang cua, qua quan
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sac ky)) lang xa hoi. hieu qua cua truc va ((danh viet) or (doanh vien)) cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) lang xa hoi. hieu qua cua truc va ((danh viet) OR (doanh vien)) cac tro.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sac ky)) lang xa hoi. hieu qua cua truc va ((danh viet) or (doanh vien)) cac tro".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sac ky)) lang xa hoi. hieu qua cua truc va ((danh viet) or (doanh vien)) cac tro*.