Perhaps you should try some spelling variations:
cau triet » cau trieu, su triet, cua triet
thuc day » thuc dan, thuc vat
cau treo » cau theo, cau tren, cau trieu
hieu van » hieu va, thien van, lieu va
minh hai » minh khai, tinh hai, manh hai
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
thuc va » thuc vat, thuc dan
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang

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