Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cong » viec cong, tien cong, dien cong
cong chuc » cong thuc, cong cu, cong cua
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty dang » ty xang, ky dang, ty hang
xay hoi » xa hoi, tay hoi, cay phoi
chuc va » thuc va, thuc vat
va tinh » may tinh

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 xay hoi. hieu vien cong chuc va tinh ((va cac) or (va che)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty dang xay hoi. hieu vien cong chuc va tinh ((va cac) OR (va che)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty dang xay hoi. hieu vien cong chuc va tinh ((va cac) or (va che)) tre*.