Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
dinh de » dinh ve, dinh du, dinh le
lang xa » lang ha, dang xay, lang van
va dinh » van dinh, va kinh, va tinh
de cua » le cua, te cua, dieu cua
xuc va » duc va, tuc va, luc va
cua te » cua tu
ve cac » va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (lang xa)) hoi. hieu ((ve cac) OR (vien cac)) xuc va dinh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang xa)) hoi. hieu ((ve cac) OR (vien cac)) xuc va dinh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (lang xa)) hoi. hieu ((ve cac) OR (vien cac)) xuc va dinh de cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (lang xa)) hoi. hieu ((ve cac) OR (vien cac)) xuc va dinh de cua te*.