Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
cua thuoc » nha thuoc, cay thuoc, cua nuoc
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
quan cau » quang cao, toan cau, quan ha
cau phuc » cau truc, chau phu, huu phuc
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
phuc va » phuc vu, thuc va, chuc va
va hanh » van hanh, va thanh, va danh
cua te » cua tu

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 quan cau phuc va hanh vi ((cua te) or (cua thuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay lang xa hoi. hieu quan cau phuc va hanh vi ((cua te) OR (cua thuoc)).
• Adding a wildcard symbol may retrieve word variants: tu sach tay lang xa hoi. hieu quan cau phuc va hanh vi ((cua te) or (cua thuoc))*.