Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
cau treo » cau theo, cau tren, cau trieu
hieu van » hieu va, thien van, lieu va
sach ly » sach y, sach lo, sach ty
va hanh » van hanh, va thanh, ban hanh
su sach » so sach, vu sach
va danh » va dinh, va dan, dia danh
cao hoi » cau hoi, co hoi, cao hoc
ly nang » ky nang, ly hang, ly vang
van am » van nam, van lam, van dam

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 cao hoi. hieu van am thuc ((va danh) OR (va hanh)) hai ((cau treo) or (cau triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang cao hoi. hieu van am thuc ((va danh) OR (va hanh)) hai ((cau treo) OR (cau triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang cao hoi. hieu van am thuc ((va danh) OR (va hanh)) hai ((cau treo) or (cau triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang cao hoi. hieu van am thuc ((va danh) OR (va hanh)) hai ((cau treo) or (cau triet))*.