Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, tu cach
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
loc va » hoc va
luc va » duc va, tuc va
va cua » va chua, via cua, ca cua

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 (te sach)) ty nang ma hoi. hieu ve cham ((loc va) OR (luc va)) hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty nang ma hoi. hieu ve cham ((loc va) OR (luc va)) hanh va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ty nang ma hoi. hieu ve cham ((loc va) OR (luc va)) hanh va cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ty nang ma hoi. hieu ve cham ((loc va) OR (luc va)) hanh va cua tre*.