Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » tu sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
dinh dai » dinh dat, sinh dai, dinh dao
van chat » cao chat
lang xa » lang ha, dang xay, lang van
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang

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