Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
tang xa » trang xa, tang ma, tang ha
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
cua tre » cuu tre, cua triet, dua tren
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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 ((tang xa) OR (lang xa)) hoi. hieu ve cam duc tan hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((tang xa) OR (lang xa)) hoi. hieu ve cam duc tan hanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((tang xa) OR (lang xa)) hoi. hieu ve cam duc tan hanh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((tang xa) OR (lang xa)) hoi. hieu ve cam duc tan hanh vi ((cua tre) or (cua te))*.