Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ve triet » va trien, su triet
hoi hoi » hoi hoc, hoc hoi, hoi doi
ky tang » ky nang, ky dang, kho tang
sach ky » sac ky, sach y, sach ty
cam duc » cam xuc, cao duc, pham duc
hanh de » hanh ve, hanh kem
hang di » hang doi, hang vi, hang dien
hieu va » lieu va, hieu qua
ho hoi » hoc hoi, hoa hoi, co hoi
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky tang ((ho hoi) OR (hoi hoi)). hieu va cam duc va ((hanh de) or (hang di)) ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky tang ((ho hoi) OR (hoi hoi)). hieu va cam duc va ((hanh de) OR (hang di)) ve triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky tang ((ho hoi) OR (hoi hoi)). hieu va cam duc va ((hanh de) or (hang di)) ve triet*".