Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
vien cac » vien bach, vien dai, vien da
minh via » minh va, minh vua, minh giao
nang xa » nang x, nang ma, mang xa
via cua » gia cua, gian cua, giau cua
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
lo van » le van, vo van, so van
ve cac » va cac
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: thu sach ty ((nang xa) or (lang xa)) hoi. hieu ((ve cac) OR (vien cac)) lo van minh via cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((nang xa) OR (lang xa)) hoi. hieu ((ve cac) OR (vien cac)) lo van minh via cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((nang xa) or (lang xa)) hoi. hieu ((ve cac) OR (vien cac)) lo van minh via cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((nang xa) or (lang xa)) hoi. hieu ((ve cac) OR (vien cac)) lo van minh via cua te*.