Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
kenh vi » benh vi, lenh vi
su sach » so sach, vu sach
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi cau » va cau, ve cau, di cau
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: ((su sach) or (thuat lanh)) ky nang x hoi. hieu ve chat ((xuc va) OR (luc va)) kenh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuat lanh)) ky nang x hoi. hieu ve chat ((xuc va) OR (luc va)) kenh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thuat lanh)) ky nang x hoi. hieu ve chat ((xuc va) OR (luc va)) kenh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuat lanh)) ky nang x hoi. hieu ve chat ((xuc va) OR (luc va)) kenh vi cau tren*.