Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
cham luc » cham soc, nhan luc, cham cuu
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
dau vai » dau va, dau hai, dau tai
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
luc va » duc va, tuc va, loc va
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat sach)) ky ((nang ma) or (mang may)) hoi. hieu ve cham luc va dau vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky ((nang ma) OR (mang may)) hoi. hieu ve cham luc va dau vai cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky ((nang ma) or (mang may)) hoi. hieu ve cham luc va dau vai cua triet*.