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 » bach tuoc, sach nuoc, hoc nuoc
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
nang tai » hang tai, tang tai, sang tai
va nang » van nang, da nang, cam nang
cuc tre » duc tre, cua tre, cuu tre

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