Perhaps you should try some spelling variations:
hang hai » hoang hai, hang tai, thanh hai
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
luc va » tuc va, loc va
cua co » cua bo, cua cong
cua su » qua su
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu va cam ((duc va) or (luc va)) hang hai ((cua co) or (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang x hoi. hieu va cam ((duc va) OR (luc va)) hang hai ((cua co) OR (cua su)).
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. hieu va cam ((duc va) or (luc va)) hang hai ((cua co) or (cua su))*.