Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
van hanh » van thanh, ban hanh, van anh
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
sach tu » sach thu, cach tu, sach ty
tu cong » thu cong, te cong, tai cong
cong xa » cong xay, cong xua, cong ha
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
va hanh » va danh, ban hanh, dao hanh
ve su » va su

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 tu cong xa hoi. hieu vu cham duc ((((va hanh) OR (van hanh))) or (va thanh)) ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu cong xa hoi. hieu vu cham duc ((((va hanh) OR (van hanh))) OR (va thanh)) ve su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach tu cong xa hoi. hieu vu cham duc ((((va hanh) OR (van hanh))) or (va thanh)) ve su triet".
• Adding a wildcard symbol may retrieve word variants: thu sach tu cong xa hoi. hieu vu cham duc ((((va hanh) OR (van hanh))) or (va thanh)) ve su triet*.