Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, hinh tai
te sach » toc sach
han tai » hang tai, nhan tai, van tai
cac luc » cau luc, coc luc, cac nuoc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
van hoi » van hoc, van hoe, van loi
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
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: te sach ky tang ((van hoi) OR (van hoa)). hieu va cac luc va ((hanh tai) or (han tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang ((van hoi) OR (van hoa)). hieu va cac luc va ((hanh tai) OR (han tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang ((van hoi) OR (van hoa)). hieu va cac luc va ((hanh tai) or (han tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang ((van hoi) OR (van hoa)). hieu va cac luc va ((hanh tai) or (han tai)) cua tre*.