Perhaps you should try some spelling variations:
van chat » cao chat
thu nang » thi nang, thu bang, tho nang
hanh lam » thanh lap, hanh kem, hanh va
thu hang » thi hang, thuc hanh, thu huong
tan hanh » tan thanh, tang hanh, toan hanh
lam cua » nam cua, lam chat
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
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 ((thu nang) or (thu hang)) xa hoi. hieu ((van cam) or (van chat)) duc tan hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((thu nang) OR (thu hang)) xa hoi. hieu ((van cam) OR (van chat)) duc tan hanh lam cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((thu nang) or (thu hang)) xa hoi. hieu ((van cam) or (van chat)) duc tan hanh lam cua tre*.