Perhaps you should try some spelling variations:
thanh nam » hanh nam, thanh tam, thanh pham
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
nam cau » nam cao, nam cac, nam ca
van cau » van dau, van hau, van chat
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

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 van cau ((luc va) or (loc va)) thanh nam 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 van cau ((luc va) OR (loc va)) thanh nam cau tren.
• Adding a wildcard symbol may retrieve word variants: ((vu bach) or (so sach)) ly nang ma hoi. hieu van cau ((luc va) or (loc va)) thanh nam cau tren*.