Perhaps you should try some spelling variations:
thanh duoc » hanh duoc, tranh duoc, thanh phuoc
hieu van » hieu va, thien van, hieu ve
va thanh » ban thanh, va tinh, le thanh
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ve cua » le cua, de cua, te cua

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 tu nang xa hoi. ((hieu van) OR (lieu va)) thanh duoc ((va thanh) or (gia thanh)) ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang xa hoi. ((hieu van) OR (lieu va)) thanh duoc ((va thanh) OR (gia thanh)) ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu nang xa hoi. ((hieu van) OR (lieu va)) thanh duoc ((va thanh) or (gia thanh)) ve cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach tu nang xa hoi. ((hieu van) OR (lieu va)) thanh duoc ((va thanh) or (gia thanh)) ve cua tre*.