Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
chat duc » chat xuc, chat doc, chet duoc
tinh cua » trinh cua, sinh cua, tinh chat
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
va tinh » may tinh
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
cua te » cua tu

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 (vu khach)) y nang xa hoi. hieu ve chat duc va tinh cua ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) y nang xa hoi. hieu ve chat duc va tinh cua ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu khach)) y nang xa hoi. hieu ve chat duc va tinh cua ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) y nang xa hoi. hieu ve chat duc va tinh cua ((cua tre) OR (cua te))*.