Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
hanh lai » hanh lam, thanh lap, thanh loi
chat luc » chat xuc, chat lua, nhan luc
cua viet » ca viet, hoa viet, cua vat
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
luc van » luoc van, luu van, duc van
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (so sach)) ty nang x ho. hieu ve chat luc van ((hanh lai) OR (hanh tai)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (so sach)) ty nang x ho. hieu ve chat luc van ((hanh lai) OR (hanh tai)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (so sach)) ty nang x ho. hieu ve chat luc van ((hanh lai) OR (hanh tai)) cua viet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (so sach)) ty nang x ho. hieu ve chat luc van ((hanh lai) OR (hanh tai)) cua viet*.