Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
cay mang » cach mang, cay mac, cay cong
ban hanh » ban hang
dat tren » dat trong, dua tren
cau xuc » cam xuc, cau luc, cau truc
hieu va » lieu va, hieu qua
xuc ban » duc ban, cuc ban, quoc ban
may hoi » may thoi, tay hoi, mai hoi
va cau » van cau, va cac, va dau
vi dat » voi dat, vi dai, va dat

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)) ((y mang) OR (cay mang)) may hoi. hieu va cau xuc ban hanh vi dat tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ((y mang) OR (cay mang)) may hoi. hieu va cau xuc ban hanh vi dat tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) ((y mang) OR (cay mang)) may hoi. hieu va cau xuc ban hanh vi dat tren".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) ((y mang) OR (cay mang)) may hoi. hieu va cau xuc ban hanh vi dat tren*.