Perhaps you should try some spelling variations:
nhieu viec » hieu viec, nhien viet
trinh doi » trinh do, trinh hoi, tinh doi
va trinh » van trinh, va tinh, lap trinh
dang tay » dang xay, dung tay, dan tay
cua tre » cuu tre, cua triet, dua tren
viec va » vien va, viec cua, viec lam
tu sach » thu sach, su sach, te sach
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
so sanh » do sanh
va xuc » va xac, va xu
xuc va » duc va, tuc va, luc va
cua te » cua tu

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 (so sanh)) ky dang tay hoi. nhieu viec va xuc va trinh doi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (so sanh)) ky dang tay hoi. nhieu viec va xuc va trinh doi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (so sanh)) ky dang tay hoi. nhieu viec va xuc va trinh doi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (so sanh)) ky dang tay hoi. nhieu viec va xuc va trinh doi ((cua tre) OR (cua te))*.