Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua quoc
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
cua nuoc » cua quoc, cua nguoi, nha nuoc
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
qua cau » quan cau, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tay lang xa hoi. hieu qua cau truc va hanh vi ((cua tu) or (((cua thuoc) OR (cua nuoc))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay lang xa hoi. hieu qua cau truc va hanh vi ((cua tu) OR (((cua thuoc) OR (cua nuoc)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tay lang xa hoi. hieu qua cau truc va hanh vi ((cua tu) or (((cua thuoc) OR (cua nuoc))))".
• Adding a wildcard symbol may retrieve word variants: tu sach tay lang xa hoi. hieu qua cau truc va hanh vi ((cua tu) or (((cua thuoc) OR (cua nuoc))))*.