Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
viec coc » viec doc, viec cong, viec cuoi
va trinh » van trinh, va tinh, lap trinh
trinh vi » trinh va, trinh ve, trinh viet
tu sach » thu sach, te sach, tu cach
su sach » so sach
vu sach » vu bach, vu khach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va
vi cua » vai cua, di 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) or (((su sach) OR (vu sach)))) ky nang xa hoi. nhieu viec coc luc va trinh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((su sach) OR (vu sach)))) ky nang xa hoi. nhieu viec coc luc va trinh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((su sach) OR (vu sach)))) ky nang xa hoi. nhieu viec coc luc va trinh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((su sach) OR (vu sach)))) ky nang xa hoi. nhieu viec coc luc va trinh vi cua tre*.