Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thanh vai » thanh hai, thanh van, thanh oai
nhan luc » nang luc
su sach » so sach, vu sach
de nhan » do nhan, tue nhan, de thanh
hieu de » hieu ve, hieu he, hieu le
cao hoa » cao hoat, cao khoa, cau hoa
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, v nang, may nang
luc va » duc va, tuc va, loc va

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)) cao hoa. hieu de nhan luc va ((thanh vai) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ly nang)) cao hoa. hieu de nhan luc va ((thanh vai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) OR (ly nang)) cao hoa. hieu de nhan luc va ((thanh vai) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) OR (ly nang)) cao hoa. hieu de nhan luc va ((thanh vai) or (thanh tai)) cua tre*.