Perhaps you should try some spelling variations:
danh vien » doanh vien, danh viet, dan vien
vien cac » vien bach, vien dai, vien da
lang xa » lang ha, dang xay, lang van
sach ky » sach y, sach ty, sach kem
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
sac ky » cac ky, sai ky
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: thu ((sach ky) or (sac ky)) lang xa hoi. hieu qua ca ((truc va) OR (thuc va)) danh 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 ca ((truc va) OR (thuc va)) danh 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 ca ((truc va) OR (thuc va)) danh vien cac tro".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sac ky)) lang xa hoi. hieu qua ca ((truc va) OR (thuc va)) danh vien cac tro*.