Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
lang van » dang van, tang van, hoang van
van hoi » van hoa, van hoc, van hoe
hieu ve » hieu va
xuc van » duc van, luc van, xuc ban
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
y lang » o lang, _ lang, tay lang

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 y lang van hoi. ((hieu ve) or (hieu van)) cam xuc van hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y lang van hoi. ((hieu ve) OR (hieu van)) cam xuc van hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach y lang van hoi. ((hieu ve) or (hieu van)) cam xuc van hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: doc sach y lang van hoi. ((hieu ve) or (hieu van)) cam xuc van hanh vi ((cua tre) OR (cuu tre))*.