Perhaps you should try some spelling variations:
cau theo » cau thi, cau tao
cau treo » cau tren, cau triet, cau trieu
lanh hai » manh hai, thanh hai, lang chai
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
sach lo » sach dao, sach doi, sach hoi
sach ly » sach y, sach ty, sach hay
nam tuc » nam thuc, nam truc, nam tu
va lanh » va lang, va danh, va hanh
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa

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