Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
manh hanh » xanh hanh, danh thanh, minh thanh
hanh tai » thanh tai, hang tai, han tai
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
tu nong » tu dong, tu cong, tu tong
tu nang » tru nang, tu nano, tu lang
ve cac » va cac, vien cac
ve cai » va cai, ve tai, ve cau

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 ((tu nang) or (tu nong)) xa hoi. hieu ((ve cai) or (ve cac)) suc manh hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((tu nang) OR (tu nong)) xa hoi. hieu ((ve cai) OR (ve cac)) suc manh hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ((tu nang) or (tu nong)) xa hoi. hieu ((ve cai) or (ve cac)) suc manh hanh tai cua tre*.