Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
san thanh » ban thanh, van thanh, son thanh
thu sach » tu sach, thuat sach, thuoc sach
cap nuoc » dat nuoc
chau tre » chay tren, chau tho, cho tre
nuoc san » nuoc luan, nguoi san, nuoc quan
cu tren » tu tren, dua tren
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ve cap » ve cac, le cap, ve cai
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang ((x hoi) OR (o hoi)). hieu ve cap nuoc san thanh lam ((chau tre) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((x hoi) OR (o hoi)). hieu ve cap nuoc san thanh lam ((chau tre) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty nang ((x hoi) OR (o hoi)). hieu ve cap nuoc san thanh lam ((chau tre) or (cu tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((x hoi) OR (o hoi)). hieu ve cap nuoc san thanh lam ((chau tre) or (cu tren))*.