Perhaps you should try some spelling variations:
thanh vai » thanh van, thanh tai, thanh oai
thanh hai » thanh phan, thanh hoa, thanh san
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa

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