Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
van hanh » van thanh, ban hanh, van anh
viec cac » vien cac, viec cua, viec lam
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
sach ty » sach tu, sach thu, xach tay
nang ho » nang hoc, nang co, tang ho
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ro, nang x

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach y)) ((nang o) OR (nang ho)) hoi. hieu viec cac duc van hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) ((nang o) OR (nang ho)) hoi. hieu viec cac duc van hanh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach y)) ((nang o) OR (nang ho)) hoi. hieu viec cac duc van hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach y)) ((nang o) OR (nang ho)) hoi. hieu viec cac duc van hanh thai cua tre*.