Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
tuan thai » xuan thai, tuan khai, tuan tai
viec lam » viec va
thai cua » than cua, tai cuc, tri cua
luc van » luoc van, luu van, duc van
xuc van » duc van, vuc van, xuc ban
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
o lai » o lao

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 (tu san)) ky nang o lai. hieu viec lam ((xuc van) or (luc van)) tuan thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (tu san)) ky nang o lai. hieu viec lam ((xuc van) OR (luc van)) tuan thai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (tu san)) ky nang o lai. hieu viec lam ((xuc van) or (luc van)) tuan thai cua tre*.