Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
thu sach » tu sach, thuat sach, thu hoach
bac nuoc » cac nuoc, bach tuoc, sach nuoc
nuoc van » nuoc va, nuoc san, luoc van
van nang » van quang, van ban, van dong
thai cua » than cua, tri cua, dai cua
van bac » van ban, van bao, van hac
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 (thuoc sach)) y nang x ho. thien van bac nuoc van nang ((thai cua) OR (tai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuoc sach)) y nang x ho. thien van bac nuoc van nang ((thai cua) OR (tai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuoc sach)) y nang x ho. thien van bac nuoc van nang ((thai cua) OR (tai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuoc sach)) y nang x ho. thien van bac nuoc van nang ((thai cua) OR (tai cuc)) tre*.