Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
cau tren » cu tren, dau tren, ca tren
so sach » so sanh, bo sach, co sach
ly nang » ky nang, ly hang, ly vang
nang ma » tang ma, sang ma, nang cao
dam cau » dat cau, da cau, dam cao
hieu ve » hieu va, hieu van
loc va » hoc va
luc va » duc va, tuc va
ma hoi » mai hoi, xa hoi, ma hoa
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 bach) or (so sach)) ly nang ma hoi. hieu ve cau ((luc va) OR (loc va)) thanh dam cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu bach) OR (so sach)) ly nang ma hoi. hieu ve cau ((luc va) OR (loc va)) thanh dam cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu bach) or (so sach)) ly nang ma hoi. hieu ve cau ((luc va) OR (loc va)) thanh dam cau tren".
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (so sach)) ly nang ma hoi. hieu ve cau ((luc va) OR (loc va)) thanh dam cau tren*.