Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hieu vien » hieu viec, thieu nien, hieu tieng
va trinh » van trinh, va tinh, lap trinh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ho » nang hoc, nang co, tang ho
vai cua » hai cua, lai cua, bai cua
ho hoi » hoc hoi, hoa hoi, hoi hoi
dai va » mai va

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 ho hoi. ((hieu vien) or (hieu hien)) can dai va trinh ((vai cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ho hoi. ((hieu vien) OR (hieu hien)) can dai va trinh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ho hoi. ((hieu vien) or (hieu hien)) can dai va trinh ((vai cua) OR (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ho hoi. ((hieu vien) or (hieu hien)) can dai va trinh ((vai cua) OR (dai cua)) tre*.