Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
phap thu » phap thuc, phap tu, phap che
su sach » so sach, vu sach
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
ve phap » va phap, de phap, ve phan
va danh » va dinh, va dan, va hanh
danh te » danh tu, danh het, danh yen
thu va » thuc va, thue va, tu va
te cua » tue cua, le cua, de cua
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) or (su sach)) ty xang xa hoi. hieu ve phap thu va danh te cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ty xang xa hoi. hieu ve phap thu va danh te cua te*.