Perhaps you should try some spelling variations:
thien van » thi van
thu sach » thuat sach, thuoc sach, thu hoach
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
cac tren » ca tren, cau tren, rac tren
nam dua » nam da, nam cua, nam mua
dua ban » dia ban, cua ban, qua ban
tu sach » su sach, te sach, tu cach
vai cac » va cac, tai cac, voi cac
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 (tu sach)) ky nang ((ma hoi) or (ma hoa)). thien van nam dua ban hanh vai cac tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky nang ((ma hoi) OR (ma hoa)). thien van nam dua ban hanh vai cac tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky nang ((ma hoi) or (ma hoa)). thien van nam dua ban hanh vai cac tren*.