Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc van » thuc vat, thuc dan, thuc va
hanh tai » thanh tai, hang tai, han tai
su triet » su viet, su tien, ve triet
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
hanh va » hang va, hanh vi
tuc van » truc van, tuc va, duc van
ve cac » va cac, vien cac

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 ky dang xa hoi. hieu ve cac ((tuc van) or (thuc van)) ((hanh tai) or (hanh va)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky dang xa hoi. hieu ve cac ((tuc van) OR (thuc van)) ((hanh tai) OR (hanh va)) su triet.
• Adding a wildcard symbol may retrieve word variants: thu sach ky dang xa hoi. hieu ve cac ((tuc van) or (thuc van)) ((hanh tai) or (hanh va)) su triet*.