Perhaps you should try some spelling variations:
chat luoc » chat luong, chat hoc, chat xuc
doc sach » hoc sach, toc sach, nuoc sach
thi hanh » thi thanh
sach thi » sach thu, sach tai, sach thieu
cua tre » cua te, cua triet, dua tren
luoc va » nuoc va, duoc va, loc va
cuu tre » cau tren, cau treo
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
hanh xa » hanh va, hanh ma, hanh xu
anh vi » anh va, anh ve, anh vu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach thi hanh xa hoi. hieu va chat luoc va ((anh vi) OR (hanh vi)) ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach thi hanh xa hoi. hieu va chat luoc va ((anh vi) OR (hanh vi)) ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach thi hanh xa hoi. hieu va chat luoc va ((anh vi) OR (hanh vi)) ((cua tre) or (cuu tre))*".