Perhaps you should try some spelling variations:
thanh di » thanh doi, thanh de, thanh do
su sach » so sach, vu sach
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
va cham » va chat, va tham
duc ban » duc van, dua ban, duc man
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
di cua » dai cua, doi cua, de cua

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 ((y nang) OR (ly nang)) xa hoi. hieu va cham ((duc ban) or (duc tan)) thanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) xa hoi. hieu va cham ((duc ban) OR (duc tan)) thanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ly nang)) xa hoi. hieu va cham ((duc ban) or (duc tan)) thanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ly nang)) xa hoi. hieu va cham ((duc ban) or (duc tan)) thanh di cua tre*.