Perhaps you should try some spelling variations:
viet cau » viet chau, viet ca, viet chu
thu sac » thu sach, thu san, thu xac
hieu ve » hieu va, hieu van
nang co » nang cao, nang doc, nang noi
ve cam » ve cham, ve cac, va cam
xuc va » duc va, luc va, xac va
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
co hoi » co hoc, co loi
da cau » dat cau, va cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky nang co hoi. hieu ve cam ((xuc va) or (tuc va)) hanh ((viet cau) or (da cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang co hoi. hieu ve cam ((xuc va) OR (tuc va)) hanh ((viet cau) OR (da cau)) tren.
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang co hoi. hieu ve cam ((xuc va) or (tuc va)) hanh ((viet cau) or (da cau)) tren*.