Perhaps you should try some spelling variations:
toan thanh » tran thanh, hoan thanh, toan thang
duc toan » duc tan, duc ton, duc hoan
thanh vi » hanh vi, thanh va, thanh ve
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cao duc » dao duc, cao suc, giao duc
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu hoach)) ky nang xa hoi. ((hieu va) OR (lieu va)) cao duc toan thanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ky nang xa hoi. ((hieu va) OR (lieu va)) cao duc toan thanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) ky nang xa hoi. ((hieu va) OR (lieu va)) cao duc toan thanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ky nang xa hoi. ((hieu va) OR (lieu va)) cao duc toan thanh vi cua tre*.