Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuoc sach, thu hoach
nang ma » tang ma, nang cao, mang may
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
sang ma » tang ma, sang tao, mang may
di cua » dai cua, doi cua, de cua

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 (thuat sach)) ky ((nang ma) OR (sang ma)) hoi. hieu qua cac duc va hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ky ((nang ma) OR (sang ma)) hoi. hieu qua cac duc va hanh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) ky ((nang ma) OR (sang ma)) hoi. hieu qua cac duc va hanh di cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) ky ((nang ma) OR (sang ma)) hoi. hieu qua cac duc va hanh di cua triet*.