Perhaps you should try some spelling variations:
hau treo » cau treo, cau theo, dau tren
hieu van » hieu va, thien van, lieu va
dang dai » dang hai, dang bai, dang dan
dai hau » dai han, dai hai, dai huu
su sach » so sach, vu sach
ly nang » ly hang, ly vang, ly quang
van cam » van nam, van lam, van cau
co hoi » co hoc, co loi
tuc va » thuc va, truc va, duc va

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 ((ly nang) or (ky nang)) co hoi. hieu van cam ((tuc va) OR (tuc xa)) dang dai hau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ky nang)) co hoi. hieu van cam ((tuc va) OR (tuc xa)) dang dai hau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) or (ky nang)) co hoi. hieu van cam ((tuc va) OR (tuc xa)) dang dai hau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ky nang)) co hoi. hieu van cam ((tuc va) OR (tuc xa)) dang dai hau treo*.