Perhaps you should try some spelling variations:
thien van » thi van
thu sach » thuat sach, thuoc sach, thu hoach
bac nuoc » cac nuoc, bach tuoc, sach nuoc
thai cua » than cua, tai cuc, dai cua
tu sach » su sach, te sach, tu cach
van bac » van ban, van bao, van hac
va nang » van nang, da nang, cam nang
y nang » ky nang, ly nang, v nang

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 (tu sach)) y nang x ho. thien van bac nuoc va nang ((thai cua) OR (tri cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) y nang x ho. thien van bac nuoc va nang ((thai cua) OR (tri cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) y nang x ho. thien van bac nuoc va nang ((thai cua) OR (tri cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) y nang x ho. thien van bac nuoc va nang ((thai cua) OR (tri cua)) tre*.