Perhaps you should try some spelling variations:
thien van » thi van
van pham » san pham, van phan, van phat
thai cua » than cua, tai cuc, tri cua
thi cua » thi cuc, tri cua, thi dua
ban ban » ban banh, van ban, can ban
duc ban » duc tan, duc van, dua ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 ky nang ((o hoi) or (o hai)). thien van pham duc ban ban ((thi cua) OR (thai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (o hai)). thien van pham duc ban ban ((thi cua) OR (thai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoi) or (o hai)). thien van pham duc ban ban ((thi cua) OR (thai cua)) te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (o hai)). thien van pham duc ban ban ((thi cua) OR (thai cua)) te*.