Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue mang » thuat mang, thu hang, thu bang
van chat » cao chat
tan hanh » tan thanh, tang hanh, toan hanh
hanh lam » thanh lap, hanh kem, hanh va
tu sach » thu sach, su sach, te sach
mang xa » lang xa, mang may, dang xay
van lam » van nam
van cau » van dau, van hau, toan cau
lam cua » nam cua, lam chat
cua tre » cua te, cuu tre, cua triet

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