Perhaps you should try some spelling variations:
qua triet » cua triet, qua trinh, qua tieu
thanh cac » hanh cac, thanh bac, thanh ca
cac qua » cau qua, tac quan
dua ban » dia ban, cua ban, qua ban
duc ban » duc tan, duc van, duc man
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
va pham » van pham, va phat, va phap
ha hoi » hoa hoi, ha noi, xa hoi

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 ((ky lang) or (ky dang)) ha hoi. hieu va pham ((duc ban) OR (dua ban)) thanh cac qua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky lang) OR (ky dang)) ha hoi. hieu va pham ((duc ban) OR (dua ban)) thanh cac qua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky lang) or (ky dang)) ha hoi. hieu va pham ((duc ban) OR (dua ban)) thanh cac qua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky lang) or (ky dang)) ha hoi. hieu va pham ((duc ban) OR (dua ban)) thanh cac qua triet*.