Perhaps you should try some spelling variations:
doanh vien » doanh tien, doanh chien, thanh vien
danh vien » danh viet, dan vien, danh kien
cua truc » cua tuc, cua thuoc, cua trung
lang van » dang van, tang van, hoang van
van hoi » van hoa, van hoc, van hoe
qua cua » quan cua, quang cua, qua quan
sach ky » sac ky, sach ty, sach kem
truc va » thuc va, thuc vat, trung va
da tro » de tro, va tro, da tao

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