Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
tu cach » tu cac
su sach » so sach, vu sach
tinh de » tinh da, sinh de, tinh he
cua tre » cua te, cuu tre, cua triet
soc va » hoc va, doc va, goc va
loc va » hoc va, luc va
de cua » le cua, te cua, dieu 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: ((tu cach) or (su sach)) ky nang x hoi. hieu qua cham ((soc va) OR (loc va)) tinh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (su sach)) ky nang x hoi. hieu qua cham ((soc va) OR (loc va)) tinh de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (su sach)) ky nang x hoi. hieu qua cham ((soc va) OR (loc va)) tinh de cua tre*".