Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh di » tinh doi, trinh di, tinh da
va nhan » van nhan, ca nhan, va phan
su sach » so sach, vu sach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
te sach » toc sach
hieu va » lieu va, hieu qua
luc va » tuc va, loc va
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: ((su sach) or (te sach)) ky dang xa hoi. hieu va nhan ((luc va) OR (duc va)) tinh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (te sach)) ky dang xa hoi. hieu va nhan ((luc va) OR (duc va)) tinh di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (te sach)) ky dang xa hoi. hieu va nhan ((luc va) OR (duc va)) tinh di cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (te sach)) ky dang xa hoi. hieu va nhan ((luc va) OR (duc va)) tinh di cua triet*.