Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
cau treo » cau theo, cau tren, cau triet
lanh hai » manh hai, thanh hai, lang chai
va lanh » va lang, va danh, va hanh
nam tuc » nam thuc, nam truc, nam tu
sach lo » sach dao, sach doi, sach hoi
su sach » so sach, vu sach
mai hoi » mai khoi, dai hoi, lai hoi
lo nang » ho nang, ly nang, loai nang
tuc va » thuc va, truc va, tuc xa
ma hoi » xa hoi, ma hoa, me hoi

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