Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
tinh hoc » sinh hoc, tin hoc, hinh hoc
viec lam » viec va
hoc cuu » hoc huu, hoc cua, hoc cau
va tinh » may tinh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va

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 ky ((nang xa) or (nang ma)) hoi. nhieu ((vien cac) or (viec lam)) xuc va tinh hoc cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. nhieu ((vien cac) OR (viec lam)) xuc va tinh hoc cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (nang ma)) hoi. nhieu ((vien cac) or (viec lam)) xuc va tinh hoc cuu tre*.