Perhaps you should try some spelling variations:
danh vien » doanh vien, danh viet, dan vien
thu sach » tu sach, thuat sach, thuoc sach
quan cau » quang cao, toan cau, quan ha
vat danh » va danh, van danh, luat danh
vien cac » vien bach, vien dai, vien da
qua cac » cua cac
y lang » o lang, _ lang, tay lang
ha hoi » hoa hoi, ha noi, va hoi

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 y lang ((ha hoi) OR (xa hoi)). hieu ((quan cau) or (qua cac)) thuc vat danh vien cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y lang ((ha hoi) OR (xa hoi)). hieu ((quan cau) OR (qua cac)) thuc vat danh vien cac tro.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y lang ((ha hoi) OR (xa hoi)). hieu ((quan cau) or (qua cac)) thuc vat danh vien cac tro".
• Adding a wildcard symbol may retrieve word variants: thu sach y lang ((ha hoi) OR (xa hoi)). hieu ((quan cau) or (qua cac)) thuc vat danh vien cac tro*.