Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hieu he » hieu ve, hiem he, hieu le
va hanh » van hanh, va danh, ban hanh
he ban » te ban, he dan, ve ban
ban bo » can bo, ban do, ban co
vi cau » va cau, ve cau, di cau
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang x hoi. hieu he ban bo ((va hanh) or (va thanh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu he ban bo ((va hanh) OR (va thanh)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu he ban bo ((va hanh) or (va thanh)) vi cau tren*.