Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
truc van » truc va, truc ban, truc dan
thuc van » thuc vat, thuc dan, thuc va
hanh va » hang va, hanh vi
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
va dai » va dao, vi dai, va dau
ang xa » lang xa, mang xa, dang xay
ty ang » ty xang, ty hang, ty anh

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