Perhaps you should try some spelling variations:
tham soc » tham nuoc, thai son, ham so
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
cao hoi » cau hoi, co hoi, cao hoc
y nang » ky nang, ly nang, v nang
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di 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 y nang cao hoi. lieu va ((tham soc) or (cham soc)) va dan vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang cao hoi. lieu va ((tham soc) OR (cham soc)) va dan vi cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang cao hoi. lieu va ((tham soc) or (cham soc)) va dan vi cua viet*.