Perhaps you should try some spelling variations:
tang dai » tang tai, tang dan, lang dai
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
va cham » va chat, va tham
cuu tre » cau tren, cau treo
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
ky tang » ky nang, ky dang, kho tang
luc va » duc va, tuc va, loc va
ve cai » va cai, ve cac, ve tai

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 ky tang dai hoi. hieu ((ve cai) or (va cham)) luc va hanh tai ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang dai hoi. hieu ((ve cai) OR (va cham)) luc va hanh tai ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky tang dai hoi. hieu ((ve cai) or (va cham)) luc va hanh tai ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang dai hoi. hieu ((ve cai) or (va cham)) luc va hanh tai ((cuu tre) OR (cua tre))*.