Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
vu sach » vu bach, su sach, vu khach
dam cua » dai cua, day cua, nam cua
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
luc va » duc va, tuc va
loc va » hoc va
ve cau » ke cau, va cau, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sach)) ly nang ma hoi. hieu ve cau ((luc va) OR (loc va)) thanh dam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) ly nang ma hoi. hieu ve cau ((luc va) OR (loc va)) thanh dam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (so sach)) ly nang ma hoi. hieu ve cau ((luc va) OR (loc va)) thanh dam cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) ly nang ma hoi. hieu ve cau ((luc va) OR (loc va)) thanh dam cua tre*.