Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
truc van » truc va, thuc van, truc ban
dai truc » dai thuc, doan truc, dai trung
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
tu xang » ty xang, tu lang, tu quang
va dai » va dao, vi dai, va dau

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 (thuat sach)) tu xang xa hoi. hieu va dai truc van ((anh va) OR (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) tu xang xa hoi. hieu va dai truc van ((anh va) OR (hanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) tu xang xa hoi. hieu va dai truc van ((anh va) OR (hanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) tu xang xa hoi. hieu va dai truc van ((anh va) OR (hanh va)) cua tre*.