Perhaps you should try some spelling variations:
doan mang » doan manh, toan mang, doan quang
hieu van » hieu va, thien van, lieu va
mang cua » manh cua, dung cua, ban cua
toc sach » hoc sach, doc sach, thuoc sach
van lam » van nam
duoc va » nuoc va, duoc ma, duong va
dang ha » dong ha, dung ha, lang ha
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ky dang ha hoi. hieu van lam ((duoc va) or (duc va)) doan mang cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky dang ha hoi. hieu van lam ((duoc va) OR (duc va)) doan mang cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ky dang ha hoi. hieu van lam ((duoc va) or (duc va)) doan mang cua tre*".