Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
trinh vat » trinh van, trinh luat, sinh vat
choi tre » cho tre, tuoi tre, khoe tre
dang xay » dang van, van xay
viec bac » viec ban, viec bao, viet bac
tinh va » tich va, trinh van, tinh gia
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
bac hue » bach hue, bac thua
hue va » thue va, nhue va, he va

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 ky dang xay hoi. hieu viec bac hue va ((tinh va) OR (trinh vat)) choi tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xay hoi. hieu viec bac hue va ((tinh va) OR (trinh vat)) choi tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xay hoi. hieu viec bac hue va ((tinh va) OR (trinh vat)) choi tre*.