Perhaps you should try some spelling variations:
thai cua » than cua, tai cuc, tri cua
su sach » so sach, vu sach
cac luc » cau luc, coc luc, cac nuoc
hai cua » dai cua, hoi cua, lai cua
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tai hai » thi hai, dai hai, tai ha
tai hoi » tai khoi, dai hoi, tai hoe
luc va » duc va, tuc va, loc va
ve cac » va cac, vien cac

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 ((tai hoi) OR (tai hai)). hieu ve cac luc va hanh ((hai cua) or (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((tai hoi) OR (tai hai)). hieu ve cac luc va hanh ((hai cua) OR (thai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((tai hoi) OR (tai hai)). hieu ve cac luc va hanh ((hai cua) or (thai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((tai hoi) OR (tai hai)). hieu ve cac luc va hanh ((hai cua) or (thai cua)) tre*.