Perhaps you should try some spelling variations:
sach nham » sach nha, sach tham, sach han
nham nang » phap nang, cam nang, kha nang
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
ca tren » cau tren, cu tren, la tren
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach nham nang ma hoi. hieu van cau ((tuc va) or (duc va)) hanh vi ((ca tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach nham nang ma hoi. hieu van cau ((tuc va) OR (duc va)) hanh vi ((ca tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: su sach nham nang ma hoi. hieu van cau ((tuc va) or (duc va)) hanh vi ((ca tren) or (cua te))*.