Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
dan viet » danh viet, dang viet, san viet
viet cac » vien cac, viet ca, viet bac
qua cau » quan cau, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
y lang » o lang, _ lang, yen lang
va dan » ca dan, va dao, 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 ((y lang) or (tay lang)) xa hoi. hieu qua cau truc va dan viet cac tro~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((y lang) OR (tay lang)) xa hoi. hieu qua cau truc va dan viet cac tro.
• Adding a wildcard symbol may retrieve word variants: thu sach ((y lang) or (tay lang)) xa hoi. hieu qua cau truc va dan viet cac tro*.