Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thien van » thi van
hoc sach » hoc sinh, hoc cac, hoc anh
hieu van » hieu va, lieu va, hieu ve
chat duc » chat xuc, chat doc, chet duoc
va thanh » gia thanh, ban thanh, va tinh
so sanh » do sanh
nang o » nang co, nang ho, nang ro
cua tu » cua tuc, cua su, cua cu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (so sanh)) ky nang o hoi. ((hieu van) OR (thien van)) chat duc va thanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (so sanh)) ky nang o hoi. ((hieu van) OR (thien van)) chat duc va thanh dai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (so sanh)) ky nang o hoi. ((hieu van) OR (thien van)) chat duc va thanh dai cua tu*".