Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh va » thanh van, hanh va, thanh ha
pham duy » pham duc
duy gia » duy gian, duc gia, quy gia
hieu va » hieu qua
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai hai, dai moi
mai hoi » mai khoi, lai hoi, mai doi
va cua » va chua, via cua, ca 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 ky nang ((mai hoi) or (dai hoi)). ((hieu va) or (lieu va)) pham duy gia thanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((mai hoi) OR (dai hoi)). ((hieu va) OR (lieu va)) pham duy gia thanh va cua te.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((mai hoi) or (dai hoi)). ((hieu va) or (lieu va)) pham duy gia thanh va cua te*.