Perhaps you should try some spelling variations:
tan thanh » tran thanh, tang thanh, toan thanh
thanh di » thanh doi, thanh de, thanh do
cua viet » ca viet, cua vat, cua dieu
thu san » thuy san, thu ban, phu san
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 san » tu ban, tu can, vu san

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