Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cua duc » cua tuc, cua nuoc, cua quoc
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ca duc » cao duc, ca dua, ha duc
di cua » dai cua, doi cua, do cua
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky lang xa hoi. hieu qua ((ca duc) OR (cua duc)) tan hanh ((di cua) or (de cua)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky lang xa hoi. hieu qua ((ca duc) OR (cua duc)) tan hanh ((di cua) OR (de cua)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky lang xa hoi. hieu qua ((ca duc) OR (cua duc)) tan hanh ((di cua) or (de cua)) viet".
• Adding a wildcard symbol may retrieve word variants: tu san ky lang xa hoi. hieu qua ((ca duc) OR (cua duc)) tan hanh ((di cua) or (de cua)) viet*.