Perhaps you should try some spelling variations:
ban hanh » ban hang
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
cu tren » tu tren, dua tren
nang ma » tang ma, sang ma, nang cao
va cam » va cham, va cac, va cao
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
vi cu » vi su, vi xu, vi du

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky nang ma hoi. hieu ((ve cac) or (va cam)) xuc ((ban hanh) or (va danh)) vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang ma hoi. hieu ((ve cac) OR (va cam)) xuc ((ban hanh) OR (va danh)) vi cu tren.
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang ma hoi. hieu ((ve cac) or (va cam)) xuc ((ban hanh) or (va danh)) vi cu tren*.