Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
luan thuc » dan thuc, nhan thuc, toan thuc
cau theo » cau thi, cau tao
sieu van » hieu van, su van, lieu va
van luan » van quan, van tuan, von luan
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
nang xa » nang x, lang xa, mang xa
cu tren » tu tren, dua tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y ((nang xa) or (nang ma)) hoi. sieu van luan thuc va hanh vi ((cau theo) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y ((nang xa) OR (nang ma)) hoi. sieu van luan thuc va hanh vi ((cau theo) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: thuat sach y ((nang xa) or (nang ma)) hoi. sieu van luan thuc va hanh vi ((cau theo) or (cu tren))*.