Perhaps you should try some spelling variations:
gat thanh » dat thanh, tat thanh, vat thanh
thanh ve » hanh ve, thanh va, thanh vien
truc gat » truc giac, truc va, truc may
tu sach » thu sach, su sach, tu cach
ky tang » ky nang, ky dang, kho tang
tang ha » lang ha, tang ma, trung ha
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
va cau » van cau, va dau, va cao
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: ((tu sach) or (te sach)) ky tang ha hoi. hieu ((va cau) OR (va cac)) truc gat thanh ve cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang ha hoi. hieu ((va cau) OR (va cac)) truc gat thanh ve cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky tang ha hoi. hieu ((va cau) OR (va cac)) truc gat thanh ve cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang ha hoi. hieu ((va cau) OR (va cac)) truc gat thanh ve cua tre*.