Perhaps you should try some spelling variations:
hoang van » hang va
van thanh » ban thanh, van tuan
lang van » dang van, tang van, giang van
cham cuu » cap cuu, chat cua
van hanh » ban hanh, van anh, van ban
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cua tu » cua tuc, cua su, cua cu

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 _ ((lang van) or (hoang van)) hoe. hieu ve cham cuu ((van hanh) OR (van thanh)) tri cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach _ ((lang van) OR (hoang van)) hoe. hieu ve cham cuu ((van hanh) OR (van thanh)) tri cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach _ ((lang van) or (hoang van)) hoe. hieu ve cham cuu ((van hanh) OR (van thanh)) tri cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach _ ((lang van) or (hoang van)) hoe. hieu ve cham cuu ((van hanh) OR (van thanh)) tri cua tu*.