Perhaps you should try some spelling variations:
tang hanh » tang thanh, dang hanh, nang hanh
tan hanh » tan thanh, toan hanh, tran hanh
cua viet » ca viet, hoa viet, cua vat
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
di cua » dai cua, doi cua, de 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 can ky lang xa hoi. hieu qua cac duc ((tan hanh) OR (tang hanh)) di cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky lang xa hoi. hieu qua cac duc ((tan hanh) OR (tang hanh)) di cua viet".
• Adding a wildcard symbol may retrieve word variants: tu can ky lang xa hoi. hieu qua cac duc ((tan hanh) OR (tang hanh)) di cua viet*.