Perhaps you should try some spelling variations:
doanh vien » doanh tien, doanh chien, thanh vien
thu sach » thuat sach, thuoc sach, thu hoach
truc van » thuc van, truc ban, truc dan
vien cac » vien bach, vien dai, vien da
tu sach » su sach, te sach, tu cach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
truc va » thuc va, thuc vat, trung va
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) OR (thu sach)) ky lang xa hoi. hieu qua ca ((truc van) or (truc va)) doanh vien cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky lang xa hoi. hieu qua ca ((truc van) OR (truc va)) doanh vien cac tro*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky lang xa hoi. hieu qua ca ((truc van) or (truc va)) doanh vien cac tro*".