Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh ve » hanh ve, thanh va, thanh vien
cuc ban » cua ban, cac ban, cuu ban
luc ban » duc ban, luc bat, luc van
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ve cua » le cua, de cua, te cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((y nang) or (v nang)) xa hoi. hieu va cao ((luc ban) OR (cuc ban)) thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y nang) OR (v nang)) xa hoi. hieu va cao ((luc ban) OR (cuc ban)) thanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y nang) or (v nang)) xa hoi. hieu va cao ((luc ban) OR (cuc ban)) thanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y nang) or (v nang)) xa hoi. hieu va cao ((luc ban) OR (cuc ban)) thanh ve cua tre*.