Perhaps you should try some spelling variations:
tang mai » tang ma, tang tai, lang mai
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
nam duc » nam duoc, pham duc, nam thuc
hanh va » hang va
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky tang mai hoi. hieu van nam duc va ((hanh tai) or (((hanh va) OR (hanh vi)))) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky tang mai hoi. hieu van nam duc va ((hanh tai) OR (((hanh va) OR (hanh vi)))) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky tang mai hoi. hieu van nam duc va ((hanh tai) or (((hanh va) OR (hanh vi)))) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky tang mai hoi. hieu van nam duc va ((hanh tai) or (((hanh va) OR (hanh vi)))) cuu tre*.