Perhaps you should try some spelling variations:
thanh de » hanh de, thanh ve, thanh do
va thanh » gia thanh, ban thanh, va tinh
cho hoc » co hoc, khoa hoc
sach ly » sach y, sach ty, sach hay
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach lo » sach dao, sach doi, sach hoi
de cua » le cua, te cua, dieu cua
cua cu » cua chu, cua cau, cua su

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 ly) or (sach lo)) lang xa hoi. hieu va ((chon loc) OR (cho hoc)) va thanh de cua cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ly) OR (sach lo)) lang xa hoi. hieu va ((chon loc) OR (cho hoc)) va thanh de cua cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ly) or (sach lo)) lang xa hoi. hieu va ((chon loc) OR (cho hoc)) va thanh de cua cu".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ly) or (sach lo)) lang xa hoi. hieu va ((chon loc) OR (cho hoc)) va thanh de cua cu*.