Perhaps you should try some spelling variations:
doanh vien » doanh tien, doanh chien, thanh vien
vien cac » vien bach, vien dai, vien da
thuc van » thuc vat, thuc dan, thuc va
dung ha » dung va, dung he, dung khoa
sach ty » sach y, sach tu, sach thu
truc va » thuc va, thuc vat, trung va
dang ha » dong ha, lang ha, tang ha
tu sach » thu sach, su sach, te sach
qua ca » qua cac, qua cua, qua cai

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 ty ((dang ha) OR (dung ha)) hoi. hieu qua ca ((thuc van) or (truc va)) doanh vien cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((dang ha) OR (dung ha)) hoi. hieu qua ca ((thuc van) OR (truc va)) doanh vien cac tro*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((dang ha) OR (dung ha)) hoi. hieu qua ca ((thuc van) or (truc va)) doanh vien cac tro*".