Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vao tuyen » va tuyen, dao tuyen, van tuyen
toc sach » hoc sach, doc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
tang ma » mang may, tang van
van cam » van nam, van lam, van cau
cam luc » cam xuc, cau luc
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (toc sach)) ky ((nang x) or (tang ma)) hoi. hieu van cam luc va hanh di vao tuyen~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (toc sach)) ky ((nang x) OR (tang ma)) hoi. hieu van cam luc va hanh di vao tuyen.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (toc sach)) ky ((nang x) or (tang ma)) hoi. hieu van cam luc va hanh di vao tuyen*.