Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec bach » vien bach, viec ban, viec bao
thanh lap » thanh san, phan lap, thanh hai
quan va » quan vi, quan ha, luan va
xuan va » xuat va, luan va, xuan ha
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
tu nano » truc nano
lap cua » lai cua, tap cua, lam cua

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 tu nano ((mai hoi) or (dai hoi)). hieu viec bach ((xuan va) or (quan va)) thanh lap cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nano ((mai hoi) OR (dai hoi)). hieu viec bach ((xuan va) OR (quan va)) thanh lap cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sach tu nano ((mai hoi) or (dai hoi)). hieu viec bach ((xuan va) or (quan va)) thanh lap cua vat*.