Perhaps you should try some spelling variations:
hieu quan » hieu qua, lieu quan, thien quan
cua nuoc » cua quoc, cua nguoi, cua thuoc
chau phu » chau phi, chau au, chau tho
tay lang » tai lang, tay tang, tay quang
cau phuc » cau truc, huu phuc, van phuc
sach tay » xach tay, sach hay, sach nay
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
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 quan ((cau phuc) OR (chau phu)) va hanh vi ((cua tu) or (cua nuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay lang xa hoi. hieu quan ((cau phuc) OR (chau phu)) va hanh vi ((cua tu) OR (cua nuoc))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tay lang xa hoi. hieu quan ((cau phuc) OR (chau phu)) va hanh vi ((cua tu) or (cua nuoc))*".