Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van nhan » van phan, van thanh, danh nhan
luoc van » luoc can, luoc va, luot van
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
luc van » luu van, duc van, luc va
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
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) or (vu bach)) ky nang x hoi. hieu van nhan ((luc van) OR (luoc van)) hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu bach)) ky nang x hoi. hieu van nhan ((luc van) OR (luoc van)) hanh tai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu bach)) ky nang x hoi. hieu van nhan ((luc van) OR (luoc van)) hanh tai cuu tre*".