Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nam truc » nam truoc, nam thuc, nam trung
chu treo » cau treo, cu tren, chu tri
ban hang » ngan hang
hieu van » hieu va, thien van, lieu va
sach ly » sach y, sach lo, sach ty
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa

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