Perhaps you should try some spelling variations:
toan hanh » toan thanh, toan anh, tran hanh
phan duc » pham duc, phan tu, phan dau
duc toan » duc tan, duc ton, duc hoan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu ke » hieu kem, chieu ke, hieu ky
ke phan » ve phan, kenh phan, ke thang
so viet » hoc viet
x hoi » xa hoi, o hoi, x ho
vi so » vi soi, vi mo, va so

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 ty nang x hoi. hieu ke phan duc toan hanh vi so viet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu ke phan duc toan hanh vi so viet*.