Perhaps you should try some spelling variations:
vien dai » hien dai
tinh via » tinh gia, tinh va, tinh vi
viec cac » viec cua, viec lam, viec va
vien cac » vien bach, vien da, gian cac
vu sach » vu bach, su sach, vu khach
via cua » gia cua, gian cua, giau cua
va tinh » may tinh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty lang xa hoi. hieu ((viec cac) or (((vien cac) OR (vien dai)))) luc va tinh via cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty lang xa hoi. hieu ((viec cac) OR (((vien cac) OR (vien dai)))) luc va tinh via cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty lang xa hoi. hieu ((viec cac) or (((vien cac) OR (vien dai)))) luc va tinh via cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ty lang xa hoi. hieu ((viec cac) or (((vien cac) OR (vien dai)))) luc va tinh via cua tre*.