Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ty nang » ty xang, ty hang, ly nang
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua, dong cua
ve cam » ve cham, ve cac, va cam
di cua » dai cua, de cua, do cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cam duc va danh ((di cua) or (doi cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cam duc va danh ((di cua) OR (doi cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cam duc va danh ((di cua) or (doi cua)) triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) OR (ky nang)) xa hoi. hieu ve cam duc va danh ((di cua) or (doi cua)) triet*.