Perhaps you should try some spelling variations:
mlang chai » cang chai, lang hai, lang thai
lang chai » lang ha, lang cua, lang phi
quoc bao » quoc oai, hoc bao, quoc va
tu sach » thu sach, su sach, te sach
ve hanh » ve thanh, ve canh, va hanh
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
ve han » ve phan, ve ban, va han
ma hoi » mai hoi, xa hoi, ma hoa

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 ky nang ma hoi. hieu ((ve han) OR (ve hanh)) quoc bao ((lang chai) or (mlang chai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu ((ve han) OR (ve hanh)) quoc bao ((lang chai) OR (mlang chai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ma hoi. hieu ((ve han) OR (ve hanh)) quoc bao ((lang chai) or (mlang chai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu ((ve han) OR (ve hanh)) quoc bao ((lang chai) or (mlang chai)) cua tre*.