Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
cuon sach » duong sach, cuoc cach, co sach
hieu ve » hieu va, hieu van
va dinh » van dinh, va kinh, va tinh
tri cau » tri dau, trinh cau, tri chat
tri cac » tri mac, tai cac, tri dac
ve dat » de dat, va dat, ve dao
x hoi » xa hoi, o hoi, x ho
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((cuon sach) or (thuat lanh)) ky nang x hoi. hieu ve dat nuoc va dinh ((tri cau) OR (tri cac)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((cuon sach) OR (thuat lanh)) ky nang x hoi. hieu ve dat nuoc va dinh ((tri cau) OR (tri cac)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((cuon sach) or (thuat lanh)) ky nang x hoi. hieu ve dat nuoc va dinh ((tri cau) OR (tri cac)) tren".
• Adding a wildcard symbol may retrieve word variants: ((cuon sach) or (thuat lanh)) ky nang x hoi. hieu ve dat nuoc va dinh ((tri cau) OR (tri cac)) tren*.