Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
lanh hai » manh hai, thanh hai, lang chai
dan lanh » dan canh, dan hanh, dat lanh
thuc dan » thuc hanh, hoc dan, thuc vat
lam thuc » lam thuoc, am thuc, nam thuc
hieu van » thien van, lieu va, hieu ve
hieu va » lieu va, hieu qua
hai cau » hai chau, hai chu, hai hau
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
ma hoi » mai 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 ly nang ((ma hoi) or (xa hoi)). ((hieu van) OR (hieu va)) lam thuc dan lanh hai cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang ((ma hoi) OR (xa hoi)). ((hieu van) OR (hieu va)) lam thuc dan lanh hai cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang ((ma hoi) or (xa hoi)). ((hieu van) OR (hieu va)) lam thuc dan lanh hai cau treo".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang ((ma hoi) or (xa hoi)). ((hieu van) OR (hieu va)) lam thuc dan lanh hai cau treo*.