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 ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
hieu te » hieu ve, hien te, hieu he
va hanh » van hanh, va danh, ban hanh
bao co » bao cao, ban co, bao ho
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 ty nang x hoi. hieu te bao co ((va hanh) or (va thanh)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. hieu te bao co ((va hanh) OR (va thanh)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. hieu te bao co ((va hanh) or (va thanh)) vi cau tren*.