Perhaps you should try some spelling variations:
nang tai » hang tai, tang tai, sang tai
hieu cua » hieu qua, dieu cua, hieu ca
bieu cua » dieu cua, ben cua, dien cua
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
tai hoi » tai khoi, dai hoi, tai hai
va danh » va dinh, va dan, va hanh
danh ca » dan ca, doanh cua, danh cho
cua tre » cua te, cuu tre, cua triet
ca cua » co cua
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ky nang tai hoi. ((hieu cua) or (bieu cua)) dat nuoc va danh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang tai hoi. ((hieu cua) OR (bieu cua)) dat nuoc va danh ca cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang tai hoi. ((hieu cua) or (bieu cua)) dat nuoc va danh ca cua tre*".