Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
doc sach » hoc sach, toc sach, nuoc sach
hien cac » thien cac, vien cac, hieu cac
hanh vai » hanh vi, hanh va, hanh tai
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
nang xa » nang x, lang xa, nang ma
lo van » le van, vo van, so van
cua tu » cua tuc, cua su, cua cu
lo va » lao va, ly va, le va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (doc sach)) ky nang xa hoi. hieu hien cac ((lo va) OR (lo van)) hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (doc sach)) ky nang xa hoi. hieu hien cac ((lo va) OR (lo van)) hanh vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (doc sach)) ky nang xa hoi. hieu hien cac ((lo va) OR (lo van)) hanh vai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (doc sach)) ky nang xa hoi. hieu hien cac ((lo va) OR (lo van)) hanh vai cua tu*.