Perhaps you should try some spelling variations:
viec cac » viec cua, viec lam, viec va
trinh vi » trinh va, trinh ve, trinh viet
va trinh » van trinh, va tinh, lap trinh
vien cac » vien bach, vien dai, vien da
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang x) OR (nang ma)) hoi. nhieu ((viec cac) OR (vien cac)) tuc va trinh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang x) or (nang ma)) hoi. nhieu ((viec cac) OR (vien cac)) tuc va trinh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang x) or (nang ma)) hoi. nhieu ((viec cac) OR (vien cac)) tuc va trinh vi cua tre*.