Perhaps you should try some spelling variations:
thien van » thi van
tan khang » van khang, tao khang, tinh khang
van pham » san pham, van phan, van phat
nang xa » nang x, lang xa, nang ma
co dan » co ban, ca dan, cao dang
tu ban » thu ban, te ban
doi va » hoi va, noi va, dai va
di va » dai va, di vao, di vat
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((co dan) or (tu ban)) ky nang xa hoi. thien van pham duc tan khang ((di va) OR (doi va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((co dan) OR (tu ban)) ky nang xa hoi. thien van pham duc tan khang ((di va) OR (doi va)) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((co dan) or (tu ban)) ky nang xa hoi. thien van pham duc tan khang ((di va) OR (doi va)) thiet".
• Adding a wildcard symbol may retrieve word variants: ((co dan) or (tu ban)) ky nang xa hoi. thien van pham duc tan khang ((di va) OR (doi va)) thiet*.