Perhaps you should try some spelling variations:
hieu cac » hieu luc, hieu va, hieu van
van hanh » van thanh, ban hanh, van ban
hien cac » thien cac, vien cac, dien cac
vai cua » dai cua, hai cua, lai cua
van anh » van thanh, tuan anh, van minh
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu

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 y nang xa hoi. dieu ((hien cac) OR (hieu cac)) lo ((van hanh) or (van anh)) vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. dieu ((hien cac) OR (hieu cac)) lo ((van hanh) OR (van anh)) vai cua tu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. dieu ((hien cac) OR (hieu cac)) lo ((van hanh) or (van anh)) vai cua tu*".