Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
thai tuc » thai thuc, thai thuy, thai hoc
dang xay » dang van, van xay
su triet » su viet, su tien, ve triet
nang xa » nang x, lang xa, nang ma
tu sach » su sach, te sach, tu cach
va thai » van thai, va tai, va tham
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
tuc va » thuc va, truc va, tuc xa

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 (tu sach)) ky ((nang xa) or (dang xay)) hoi. lieu va thai tuc va hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky ((nang xa) OR (dang xay)) hoi. lieu va thai tuc va hanh va su triet.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky ((nang xa) or (dang xay)) hoi. lieu va thai tuc va hanh va su triet*.