Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
cuu tre » cua tre, cau tren, cau treo
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
va cam » va cham, va cac, va cao
tu van » tu va
vi cuu » vi luu, vinh cuu
ve cam » ve cham, ve cac, ve cai

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

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