Perhaps you should try some spelling variations:
sach thi » sach thu, sach tai, sach thieu
thi nang » thi cong, ki nang, thi hanh
van chat » cao chat
tan hanh » tan thanh, tang hanh, toan hanh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
van hau » van ha, van hai, van dau
kem cua » em cua, keo cua, diem cua
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 thi nang xa hoi. hieu ((van cam) OR (((van hau) OR (van chat)))) duc tan hanh kem cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi nang xa hoi. hieu ((van cam) OR (((van hau) OR (van chat)))) duc tan hanh kem cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thi nang xa hoi. hieu ((van cam) OR (((van hau) OR (van chat)))) duc tan hanh kem cua tre*.