Perhaps you should try some spelling variations:
thanh va » thanh van, thanh ha, thanh ve
huu tre » huu tri, cuu tre, huu them
hanh va » hang va, hanh vi
soc ban » hoc ban, coc ban, so ban
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
tang ma » mang may, tang van
sach ty » sach y, sach tu, sach thu
ma hoi » mai hoi, xa hoi, ma hoa
sai ky » sac ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sai ky) or (sach ty)) tang ma hoi. hieu vu cham soc ban ((thanh va) OR (hanh va)) huu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sai ky) OR (sach ty)) tang ma hoi. hieu vu cham soc ban ((thanh va) OR (hanh va)) huu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sai ky) or (sach ty)) tang ma hoi. hieu vu cham soc ban ((thanh va) OR (hanh va)) huu tre".
• Adding a wildcard symbol may retrieve word variants: te ((sai ky) or (sach ty)) tang ma hoi. hieu vu cham soc ban ((thanh va) OR (hanh va)) huu tre*.