Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thuc dan » thuc hanh, hoc dan
vai cua » dai cua, hai cua, lai cua
dau vai » dau va, dau hai, dau tai
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ve nuoc » ve duoc
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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 ((y nang) or (v nang)) xa hoi. hieu ve nuoc ((thuc dan) OR (thuc vat)) dau vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (v nang)) xa hoi. hieu ve nuoc ((thuc dan) OR (thuc vat)) dau vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (v nang)) xa hoi. hieu ve nuoc ((thuc dan) OR (thuc vat)) dau vai cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (v nang)) xa hoi. hieu ve nuoc ((thuc dan) OR (thuc vat)) dau vai cua triet*.