Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, te sach
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
su viet » so viet
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de

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 ((ty nang) or (ty hang)) xa hoi. hieu ve cham duc va dan di ((cuu tre) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty hang)) xa hoi. hieu ve cham duc va dan di ((cuu tre) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty hang)) xa hoi. hieu ve cham duc va dan di ((cuu tre) or (su viet))*.