Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
ban banh » ban hanh, ban anh, ban danh
cac truc » cau truc, cac trung, sach truc
su sach » so sach, vu sach
cac tru » ca tru, cac tro, cac thu
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
di su » doi su, da su, de su
ki su » ky su

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 v nang x ho. hieu vien ((cac truc) or (cac tru)) ban banh ((di su) OR (ki su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang x ho. hieu vien ((cac truc) OR (cac tru)) ban banh ((di su) OR (ki su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang x ho. hieu vien ((cac truc) or (cac tru)) ban banh ((di su) OR (ki su)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach v nang x ho. hieu vien ((cac truc) or (cac tru)) ban banh ((di su) OR (ki su)) triet*.