Perhaps you should try some spelling variations:
cua quoc » cua nuoc, cua thuoc
hoc sach » hoc sinh, hoc cac, hoc anh
nang tai » hang tai, tang tai, sang tai
duc manh » suc manh, duc anh, duc minh
tuan vi » quan vi, luan vi, quans vi
duc van » duc va, duc tan, duc phan
tu cach » tu cac
hieu va » lieu va, hieu qua
tai hoi » tai khoi, dai hoi, tai hai
va cam » va cham, va cac, va cao
y nang » ky nang, ly nang, v nang
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (hoc sach)) y nang tai hoi. hieu va cam ((duc van) or (duc manh)) tuan vi cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (hoc sach)) y nang tai hoi. hieu va cam ((duc van) OR (duc manh)) tuan vi cua quoc.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (hoc sach)) y nang tai hoi. hieu va cam ((duc van) or (duc manh)) tuan vi cua quoc*.