Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
vai cuu » vai cua
dua ban » dia ban, cua ban, qua ban
cau dua » cau qua, cau cua, ca dua
van cau » van dau, van hau, van chat
cuu tre » cua tre, cau tren, cau treo
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (thuat sach)) ty nang ((ma hoi) or (ma hoa)). hieu van cau dua ban thanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ty nang ((ma hoi) OR (ma hoa)). hieu van cau dua ban thanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuat sach)) ty nang ((ma hoi) or (ma hoa)). hieu van cau dua ban thanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuat sach)) ty nang ((ma hoi) or (ma hoa)). hieu van cau dua ban thanh vai cuu tre*.