Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
y lang » o lang, _ lang, tay lang
cua te » cua tu

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

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