Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
tinh le » thinh le, trinh le, dinh le
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
luc va » tuc va, loc va
le cua » ly 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 ty nang xa hoi. ((hieu ve) or (hieu va)) cau ((luc va) or (duc va)) tinh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((hieu ve) OR (hieu va)) cau ((luc va) OR (duc va)) tinh le cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((hieu ve) or (hieu va)) cau ((luc va) or (duc va)) tinh le cua tre*.