Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thi nang » thi cong, ki nang, thi hanh
dua ban » dia ban, cua ban, qua ban
duc ban » duc tan, duc van, duc man
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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 v nang xa hoi. ((lieu va) or (thi nang)) lam ((duc ban) OR (dua ban)) thanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang xa hoi. ((lieu va) OR (thi nang)) lam ((duc ban) OR (dua ban)) thanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang xa hoi. ((lieu va) or (thi nang)) lam ((duc ban) OR (dua ban)) thanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang xa hoi. ((lieu va) or (thi nang)) lam ((duc ban) OR (dua ban)) thanh dai cua tre*.