Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, cau treo
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
va hanh » van hanh, va danh, ban hanh
sach ky » sac ky, sach y, sach ty
ca tren » cu tren, la tren, co tren
hieu te » hieu ve, hien te, hieu he
ban bo » can bo, ban do, ban co
te ban » te bao
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 te ban bo ((va hanh) or (va thanh)) vi ((cau tren) OR (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang x hoi. hieu te ban bo ((va hanh) OR (va thanh)) vi ((cau tren) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang x hoi. hieu te ban bo ((va hanh) or (va thanh)) vi ((cau tren) OR (ca tren))".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang x hoi. hieu te ban bo ((va hanh) or (va thanh)) vi ((cau tren) OR (ca tren))*.