Perhaps you should try some spelling variations:
thanh luc » thanh luu, than luc, nhan luc
van thanh » ban thanh, van tuan
hoang hai » hoang thi, hoang van
hieu van » hieu va, thien van, lieu va
hang hai » hang tai, thanh hai, hang va
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va

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 nang ma hoa. hieu van thanh luc va ((hang hai) OR (hoang hai)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoa. hieu van thanh luc va ((hang hai) OR (hoang hai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoa. hieu van thanh luc va ((hang hai) OR (hoang hai)) cua tre*.