Perhaps you should try some spelling variations:
thien van » thi van
doc sach » hoc sach, toc sach, nuoc sach
sach tay » xach tay, sach hay, sach nay
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
lang van » dang van, tang van, hoang van
tay lang » tai lang, tay tang, tay quang
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
xuc van » duc van, luc van, vuc van
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: doc sach tay lang van hoi. ((hieu ve) or (thien van)) cam xuc van hanh vi ((cua tre) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach tay lang van hoi. ((hieu ve) OR (thien van)) cam xuc van hanh vi ((cua tre) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: doc sach tay lang van hoi. ((hieu ve) or (thien van)) cam xuc van hanh vi ((cua tre) or (cua viet))*.