Perhaps you should try some spelling variations:
cham duc » pham duc, cham soc, pham duy
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
va cham » va chat, va tham
ma hoi » mai hoi, xa hoi, ma hoa
va han » va phan, van han, va hanh
tai va » thai va, tri va, dai va
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: ((tu sach) or (te sach)) ky nang ma hoi. lieu va cham duc va han ((tai va) OR (mai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang ma hoi. lieu va cham duc va han ((tai va) OR (mai va)) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang ma hoi. lieu va cham duc va han ((tai va) OR (mai va)) thiet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang ma hoi. lieu va cham duc va han ((tai va) OR (mai va)) thiet*.