Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
ban hanh » ban hang
toc cham » toc thai
tuc cham » tu cham, phuc cham, thuc chan
lang ha » long ha
lang xa » dang xay, lang van
tu sach » thu sach, su sach, te sach
tu ban » thu ban, te ban
vi cau » va cau, ve cau, di cau

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

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