Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
cham cuu » cap cuu, chat cua
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
ky dang » ky nang, ky danh
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
dan den » ban den, van den, dan dung
cuu va » cuu van, cuu ve
va dan » ca dan, va dao, va dau
den su » dan su, nen su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (hoc sach)) ky dang xa hoi. hieu ve cham cuu va dan den su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (hoc sach)) ky dang xa hoi. hieu ve cham cuu va dan den su triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (hoc sach)) ky dang xa hoi. hieu ve cham cuu va dan den su triet*.