Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van giao » nang giao, toan giao, dan gian
tan hanh » tan thanh, tang hanh, toan hanh
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly nang » ky nang, ly hang, ly vang
vai cua » dai cua, lai cua, bai cua
hai cua » thai cua, dai cua, hoi cua
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu van giao duc tan hanh ((vai cua) or (hai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang x hoi. hieu van giao duc tan hanh ((vai cua) OR (hai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach ly nang x hoi. hieu van giao duc tan hanh ((vai cua) or (hai cua)) tre*.