Perhaps you should try some spelling variations:
chau tho » chat thom, cau thi, phu tho
hai chau » lai chau, ha chau, hat chau
danh hai » dang hai, lanh hai, manh hai
dan danh » van danh, han danh, ban danh
thuc dan » thuc hanh, hoc dan, thuc vat
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
sach ly » sach y, sach lo, sach hay
nang ma » tang ma, sang ma, mang may
sach ty » sach y, sach tu, sach thu

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 ty)) ((nang ma) or (nang cao)) hoi. hieu van nam thuc dan danh hai chau tho~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach ty)) ((nang ma) OR (nang cao)) hoi. hieu van nam thuc dan danh hai chau tho.
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) or (sach ty)) ((nang ma) or (nang cao)) hoi. hieu van nam thuc dan danh hai chau tho*.