Perhaps you should try some spelling variations:
thu sach » tu sach, thuat 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 hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
chu tre » cho tre, chu tri, cuu tre
ve cam » ve cham, ve cac, va cam
va chu » va che, va cau, va chi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thu hoach)) ((ty nang) or (ky nang)) xa hoi. hieu ve cam duc va hanh va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thu hoach)) ((ty nang) OR (ky nang)) xa hoi. hieu ve cam duc va hanh va chu tre.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thu hoach)) ((ty nang) or (ky nang)) xa hoi. hieu ve cam duc va hanh va chu tre*.