Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, te sach, tu cach
va hanh » van hanh, va thanh, va danh
nam mua » nam cua, nam xua, nam luat
nam qua » nam quan, nam cua, nam xua
cua tre » cua te, cuu tre, cua triet
hieu ca » hieu cac, hieu cua, hieu va
su sach » so sach, vu sach
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: ((tu sach) or (su sach)) ky nang x hoi. hieu ca ((nam qua) OR (nam mua)) va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x hoi. hieu ca ((nam qua) OR (nam mua)) va hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang x hoi. hieu ca ((nam qua) OR (nam mua)) va hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x hoi. hieu ca ((nam qua) OR (nam mua)) va hanh dai cua tre*.