Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
van cao » van dao, van bao, van hao
duc van » duc tan, duc manh, duc phan
hanh ve » hanh vi, hanh va, hanh kem
y nang » ly nang, v nang, may nang
ve cua » le cua, de cua, te cua
cua te » cua tu

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