Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh van
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
ky sang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
va nam » van nam, ha nam, va nay
thu xa » thu xac, thu ha, thu xe
cua te » cua tu

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 ky sang ((mai hoi) or (xa hoi)). hieu va nam thu xa ((hanh vai) OR (hanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ((mai hoi) OR (xa hoi)). hieu va nam thu xa ((hanh vai) OR (hanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ((mai hoi) or (xa hoi)). hieu va nam thu xa ((hanh vai) OR (hanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ((mai hoi) or (xa hoi)). hieu va nam thu xa ((hanh vai) OR (hanh tai)) cua te*.