Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
hoc sach » hoc sinh, hoc cac, hoc anh
thi nang » thi cong, ki nang, thi hanh
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi hanh
lap cua » lai cua, tap cua, lam cua
nang o » nang co, nang ho, nang ro
xuc va » tuc va, luc va, xac va
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky nang o hoi. ((thi van) or (thi nang)) bac ((xuc va) OR (duc va)) thanh lap cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky nang o hoi. ((thi van) OR (thi nang)) bac ((xuc va) OR (duc va)) thanh lap cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ky nang o hoi. ((thi van) or (thi nang)) bac ((xuc va) OR (duc va)) thanh lap cua viet".
• Adding a wildcard symbol may retrieve word variants: hoc sach ky nang o hoi. ((thi van) or (thi nang)) bac ((xuc va) OR (duc va)) thanh lap cua viet*.