Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
lang van » dang van, tang van, hoang van
van hanh » van thanh, ban hanh, van anh
tuc van » thuc van, truc van, tuc va
van hoi » van hoa, van hoc, van hoe
cua tre » cuu tre, cua triet, dua tren
ve cham » va cham, ve chat, vu cham
cua te » cua tu
y lang » o lang, _ lang, tay lang
ve cam » ve cac, va cam, 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: toc sach y lang van hoi. hieu ((ve cam) or (ve cham)) tuc van hanh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y lang van hoi. hieu ((ve cam) OR (ve cham)) tuc van hanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y lang van hoi. hieu ((ve cam) or (ve cham)) tuc van hanh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach y lang van hoi. hieu ((ve cam) or (ve cham)) tuc van hanh vi ((cua tre) OR (cua te))*.