Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
truc ban » thuc ban, truc dan, truc van
tay lang » tai lang, tay tang, tay quang
cam truc » cau truc, nam truc, lam truoc
tu sach » thu sach, su sach, te sach
hanh ve » hanh vi, hanh va, hanh kem
hieu ve » hieu va
ty lang » ty xang, ty hang, tu lang
ha hoi » hoa hoi, ha noi, xa hoi
ve cua » le cua, de cua, te cua

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 ((ty lang) OR (tay lang)) ha hoi. ((hieu ve) or (hieu van)) cam truc ban hanh ve cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty lang) OR (tay lang)) ha hoi. ((hieu ve) OR (hieu van)) cam truc ban hanh ve cua vat*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty lang) OR (tay lang)) ha hoi. ((hieu ve) or (hieu van)) cam truc ban hanh ve cua vat*".