Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thuc day » thuc dan, thuc vat
tinh hai » tinh thai, tinh chat, trinh han
cau treo » cau theo, cau tren, cau triet
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan
hai cau » hai chau, hai chu, hai hau

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)) tinh hai cau treo~.
• 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)) tinh hai cau treo.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang xa hoi. hieu van nam ((thuc va) or (thuc day)) tinh hai cau treo*.