Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ly hang » ly quang
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
ly nang » ky nang, ly vang, ly quang
hai cau » hai chau, hai chu, hai hau
su sach » so sach, vu sach
van am » van nam, van lam, van dam

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