Perhaps you should try some spelling variations:
han thai » han tai, ban thai, van thai
cham duc » pham duc, cham soc, pham duy
sach ky » sac ky, sach ty, sach kem
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
thai va » thai van
lang xa » lang ha, dang xay, lang van
va han » va phan, van han, va hanh
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sach y)) ((lang xa) or (nang ma)) hoi. hieu ve cham duc va han thai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) ((lang xa) OR (nang ma)) hoi. hieu ve cham duc va han thai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) ((lang xa) or (nang ma)) hoi. hieu ve cham duc va han thai va thiet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) ((lang xa) or (nang ma)) hoi. hieu ve cham duc va han thai va thiet*.