Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
sach ky » sac ky, sach y, sach ty
duc van » duc tan, duc manh, duc phan
hanh de » hanh ve, hanh kem
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao
de cua » le cua, te cua, dieu cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang x hoi. hieu ((ve cao) OR (va cao)) ((duc van) or (duc va)) hanh de cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang x hoi. hieu ((ve cao) OR (va cao)) ((duc van) OR (duc va)) hanh de cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang x hoi. hieu ((ve cao) OR (va cao)) ((duc van) or (duc va)) hanh de cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang x hoi. hieu ((ve cao) OR (va cao)) ((duc van) or (duc va)) hanh de cua te*.