Perhaps you should try some spelling variations:
trinh cua » trinh luat, trinh quan, trinh luan
ban hanh » ban hang
tinh cua » sinh cua, tinh chat, tranh cua
dang xa » dang xay, lang xa, dang ha
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
sac ky » cac ky
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sac ky) or (sai ky)) dang xa hoi. hieu ve cam duc ban hanh ((trinh cua) OR (tinh cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (sai ky)) dang xa hoi. hieu ve cam duc ban hanh ((trinh cua) OR (tinh cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) or (sai ky)) dang xa hoi. hieu ve cam duc ban hanh ((trinh cua) OR (tinh cua)) tre".
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) or (sai ky)) dang xa hoi. hieu ve cam duc ban hanh ((trinh cua) OR (tinh cua)) tre*.