Perhaps you should try some spelling variations:
lang man » lang van, lang ban, lang mai
hanh vai » hanh vi, hanh tai, hanh van
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
man hoi » man hoai, dan hoi, van hoi
ky lang » ky nang, ky dang, ky tang

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 lang man hoi. ((hieu va) OR (lieu va)) pham duc va ((hanh vai) or (hanh va)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang man hoi. ((hieu va) OR (lieu va)) pham duc va ((hanh vai) OR (hanh va)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang man hoi. ((hieu va) OR (lieu va)) pham duc va ((hanh vai) or (hanh va)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang man hoi. ((hieu va) OR (lieu va)) pham duc va ((hanh vai) or (hanh va)) cuu tre*.