Perhaps you should try some spelling variations:
toan hanh » toan thanh, toan anh, tran hanh
duc toan » duc tan, duc ton, duc hoan
thu nang » thi nang, thu hang, thu bang
hanh lam » thanh lap, hanh kem, hanh va
sach thu » sach thue, sach thieu, sach tham
tu sach » thu sach, su sach, te sach
cua tre » cua te, cua triet, dua tren
van cau » van dau, van hau, van chat
van cam » van nam, van lam, van dam
nang xa » nang x, lang xa, nang ma
cuu tre » cau tren, cau treo

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 thu nang xa hoi. hieu ((van cam) or (van cau)) duc toan hanh lam ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang xa hoi. hieu ((van cam) OR (van cau)) duc toan hanh lam ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang xa hoi. hieu ((van cam) or (van cau)) duc toan hanh lam ((cua tre) or (cuu tre))*.