Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
vu khach » vu khanh, vu khac, vay khach
vu sach » vu bach, su sach
hieu ve » hieu va, hieu van
su viet » so viet
nang o » nang co, nang ho, nang ro
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va
lam su » lai su, lam so, lam vu
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) OR (vu khach)) ky nang o hai. hieu ve cam ((xuc va) or (duc va)) thanh lam su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang o hai. hieu ve cam ((xuc va) OR (duc va)) thanh lam su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ky nang o hai. hieu ve cam ((xuc va) or (duc va)) thanh lam su viet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) ky nang o hai. hieu ve cam ((xuc va) or (duc va)) thanh lam su viet*.