Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
hang vai » hang tai, hang hai, hang vi
nang lai » nang tai, mang lai, nang cai
vu sach » vu bach, su sach, vu khach
dau xua » dau cua, dao xuan, dau luan
xua van » xua va, qua van, cua van
sach ty » sach y, sach tu, sach thu
lai hoi » dai hoi, lai hoa, lai roi
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang lai hoi. ((hieu quan) or (hieu qua)) dau xua van ((hang vai) or (hang va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang lai hoi. ((hieu quan) OR (hieu qua)) dau xua van ((hang vai) OR (hang va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang lai hoi. ((hieu quan) or (hieu qua)) dau xua van ((hang vai) or (hang va)) cua tre*.